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diff --git a/java/samples/collections/CollectionExample.java b/java/samples/collections/CollectionExample.java
new file mode 100644
index 0000000..f9ed9e7
--- /dev/null
+++ b/java/samples/collections/CollectionExample.java
@@ -0,0 +1,125 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package collectionexample;
+
+import java.io.File;
+import java.io.FileReader;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeSet;
+
+/**
+ *
+ * @author denis
+ */
+public class CollectionExample {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        //collectionInteger();
+        
+        collectionPerson();
+    }
+    
+    public static void collectionPerson(){
+        System.out.println("-----------------ArrayList------------------");
+        List<Person> intArray = new ArrayList<>();
+        intArray.add(new Person("Boby", 11));
+        intArray.add(new Person("Andrey", 4));
+        intArray.add(new Person("Boby", 1));
+        intArray.add(new Person("Boby", 10));
+        intArray.add(new Person("Boby", 5));
+        intArray.forEach(System.out::println);
+        
+        System.out.println("-----------------LinkedList------------------");
+        List<Person> intLink = new LinkedList<>(intArray);
+        intLink.forEach(System.out::println);
+        
+        System.out.println("-----------------HashSet------------------");
+        Set<Person> intHashSet = new HashSet<>(intArray);
+        intHashSet.forEach(System.out::println);
+        
+        System.out.println("-----------------TreeSet------------------");
+//        Set<Person> intTreeSet = new TreeSet<>(new Comparator<Person>() {
+//            @Override
+//            public int compare(Person o1, Person o2) {
+//                int res = o2.name.compareTo(o1.name);
+//                if(res==0) res = o2.phone.compareTo(o1.phone);
+//                return res;
+//            }
+//        });
+        Set<Person> intTreeSet = new TreeSet<>((o1, o2) -> {
+                int res = o2.name.compareTo(o1.name);
+                if(res==0) res = o2.phone.compareTo(o1.phone);
+                return res;
+        });
+        //Set<Person> intTreeSet = new TreeSet<>((o1, o2) -> o2.name.compareTo(o1.name));
+        intTreeSet.addAll(intLink);
+        intTreeSet.forEach(System.out::println);
+        
+        System.out.println("-----------------HashMap------------------");
+        Map<Integer, Person> maps = new HashMap<>();
+        maps.put(intArray.get(0).phone, intArray.get(0));
+        maps.put(intArray.get(1).phone, intArray.get(1));
+        maps.put(intArray.get(2).phone, intArray.get(2));
+        maps.put(intArray.get(3).phone, intArray.get(3));
+        maps.put(intArray.get(4).phone, intArray.get(4));
+        maps.forEach((e1, e2) -> {System.out.println(e1 + ": " + e2);});
+       
+    }
+    
+    public static void collectionInteger(){
+        System.out.println("-----------------ArrayList------------------");
+        List<Integer> intArray = new ArrayList<>();
+        intArray.add(50);
+        intArray.add(26);
+        intArray.add(26);
+        intArray.add(50);
+        intArray.add(50);
+        intArray.forEach(System.out::println);
+        
+        System.out.println("-----------------LinkedList------------------");
+        List<Integer> intLink = new LinkedList<>(intArray);
+        intLink.forEach(System.out::println);
+        
+        System.out.println("-----------------HashSet------------------");
+        Set<Integer> intHashSet = new HashSet<>(intArray);
+        intHashSet.forEach(System.out::println);
+        
+        System.out.println("-----------------TreeSet------------------");
+        Set<Integer> intTreeSet = new TreeSet<>(intArray);
+        intTreeSet.forEach(System.out::println);
+        
+        System.out.println("-----------------HashMap------------------");
+        Map<String, Integer> maps = new HashMap<>();
+        maps.put("One", intArray.get(0));
+        maps.put("Two", intArray.get(1));
+        maps.put("Three", intArray.get(2));
+        maps.put("Four", intArray.get(3));
+        maps.put("Five", intArray.get(4));
+        maps.forEach((e1, e2) -> {System.out.println(e1 + ": " + e2);});
+        
+        System.out.println("-----------------LinkedHashMap------------------");
+        Map<String, Integer> mapsLink = new LinkedHashMap<>();
+        mapsLink.put("One", intArray.get(0));
+        mapsLink.put("Two", intArray.get(1));
+        mapsLink.put("Three", intArray.get(2));
+        mapsLink.put("Four", intArray.get(3));
+        mapsLink.put("Five", intArray.get(4));
+        mapsLink.forEach((e1, e2) -> {System.out.println(e1 + ": " + e2);});
+    }
+    
+}
diff --git a/java/samples/collections/CollectionExample2.java b/java/samples/collections/CollectionExample2.java
new file mode 100644
index 0000000..4ace277
--- /dev/null
+++ b/java/samples/collections/CollectionExample2.java
@@ -0,0 +1,131 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package collectionexample2;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+/**
+ *
+ * @author denis
+ */
+public class CollectionExample2 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        unique();
+        //simple();
+        
+    }
+    
+    private static void unique(){
+        System.out.println("--------------------ArrayList-------------------------");
+        List<User> arrayList = new ArrayList<>();
+        arrayList.add(new User("Andrey", 15));
+        arrayList.add(new User("Andrey", 20));
+        arrayList.add(new User("Andrey", 15));
+        arrayList.add(new User("Andrey", 16));
+        System.out.println("contains=" + arrayList.contains(new User("Andrey", 15)));
+        arrayList.forEach(System.out::println);
+        
+        {
+            System.out.println("--------------------LinkedList-------------------------");
+            List<User> collection = new LinkedList<>(arrayList);
+            collection.forEach(System.out::println);
+        }
+        
+        System.out.println("--------------------HashSet-------------------------");
+        {
+            System.out.println("--------------------LinkedList-------------------------");
+            Set<User> collection = new HashSet<>(arrayList);
+            collection.forEach(System.out::println);
+        }
+        
+        System.out.println("--------------------TreeSet-------------------------");
+        {
+            System.out.println("--------------------LinkedList-------------------------");
+            SortedSet<User> collection = new TreeSet<>(arrayList);
+            collection.forEach(System.out::println);
+        }
+        
+        System.out.println("--------------------HashMap-------------------------");
+        {
+            Map<Integer, User> mapColl = new HashMap<>();
+            mapColl.put(1, new User("Andrey", 15));
+            mapColl.put(10, new User("Andrey", 15));
+            mapColl.put(5, new User("Andrey", 20));
+            mapColl.put(9, new User("Andrey", 16));
+            System.out.println("contains=" + mapColl.containsValue(new User("Andrey", 15)));
+            mapColl.entrySet().forEach(e -> System.out.println(e));
+        }
+        
+        System.out.println("--------------------LinkedHashMap-------------------------");
+        {
+            Map<Integer, User> mapColl = new LinkedHashMap<>();
+            mapColl.put(1, new User("Andrey", 15));
+            mapColl.put(10, new User("Andrey", 15));
+            mapColl.put(5, new User("Andrey", 20));
+            mapColl.put(9, new User("Andrey", 16));
+            System.out.println("contains=" + mapColl.containsValue(new User("Andrey", 15)));
+            mapColl.entrySet().forEach(e -> System.out.println(e));
+        }
+    }
+    
+    private static void simple(){
+        System.out.println("--------------------ArrayList-------------------------");
+        List<String> arrayList = new ArrayList<>();
+        arrayList.add("Once");
+        arrayList.add("Two");
+        arrayList.add("Two");
+        arrayList.add("Two");
+        arrayList.add("Three");
+        arrayList.add("Four");
+        arrayList.add("Five");
+        arrayList.add("Five");
+        arrayList.forEach(System.out::println);
+        
+        System.out.println("--------------------LinkedList-------------------------");
+        List<String> linkedList = new LinkedList<>(arrayList);
+        linkedList.forEach(System.out::println);
+        
+        System.out.println("--------------------HashSet-------------------------");
+        Set<String> hashSet = new HashSet<>(arrayList);
+        hashSet.forEach(System.out::println);
+        
+        System.out.println("--------------------TreeSet-------------------------");
+        SortedSet<String> sorted = new TreeSet<>(arrayList);
+        sorted.forEach(System.out::println);
+        
+        System.out.println("--------------------HashMap-------------------------");
+        Map<Integer, String> mapColl = new HashMap<>();
+        mapColl.put(1, "Once");
+        mapColl.put(10, "Once");
+        mapColl.put(5, "Two");
+        mapColl.put(9, null);
+        mapColl.put(0, "Five");
+        mapColl.entrySet().forEach(e -> System.out.println(e));
+        
+        System.out.println("--------------------LinkedHashMap-------------------------");
+        Map<Integer, String> hashMap = new LinkedHashMap<>();
+        hashMap.put(1, "Once");
+        hashMap.put(10, "Once");
+        hashMap.put(5, "Two");
+        hashMap.put(9, null);
+        hashMap.put(0, "Five");
+        hashMap.entrySet().forEach(e -> System.out.println(e));
+    }
+    
+}
diff --git a/java/samples/collections/Person.java b/java/samples/collections/Person.java
new file mode 100644
index 0000000..1a80bb6
--- /dev/null
+++ b/java/samples/collections/Person.java
@@ -0,0 +1,69 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package collectionexample;
+
+import java.util.Objects;
+
+/**
+ *
+ * @author denis
+ */
+public class Person implements Comparable<Person>{
+    
+    public String name;
+    public Integer phone;
+
+    public Person(String name, Integer phone) {
+        this.name = name;
+        this.phone = phone;
+    }
+
+    @Override
+    public String toString() {
+        return "Person{" + "name=" + name + ", phone=" + phone + '}';
+    }
+
+    @Override
+    public int hashCode() {
+        int hash = 3;
+        hash = 37 * hash + Objects.hashCode(this.name);
+        hash = 37 * hash + Objects.hashCode(this.phone);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final Person other = (Person) obj;
+        if (!Objects.equals(this.name, other.name)) {
+            return false;
+        }
+        if (!Objects.equals(this.phone, other.phone)) {
+            return false;
+        }
+        if (!Objects.equals(this.hashCode(), other.hashCode())) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int compareTo(Person person) {
+        int res = this.name.compareTo(person.name);
+        if(res==0) res = this.phone.compareTo(person.phone);
+        return res;
+    }
+    
+    
+}
diff --git a/java/samples/collections/User.java b/java/samples/collections/User.java
new file mode 100644
index 0000000..0f4baeb
--- /dev/null
+++ b/java/samples/collections/User.java
@@ -0,0 +1,68 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package collectionexample2;
+
+import java.util.Objects;
+
+/**
+ *
+ * @author denis
+ */
+public class User implements Comparable<User>{
+    String name;
+    Integer age;
+
+    public User(String name, Integer age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "name=" + name + ", age=" + age + '}';
+    }
+
+    @Override
+    public int hashCode() {
+        int hash = 7;
+        hash = 37 * hash + Objects.hashCode(this.name);
+        hash = 37 * hash + Objects.hashCode(this.age);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final User other = (User) obj;
+        if (!Objects.equals(this.name, other.name)) {
+            return false;
+        }
+        if (!Objects.equals(this.age, other.age)) {
+            return false;
+        }
+        if (!Objects.equals(this.hashCode(), other.hashCode())) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int compareTo(User o) {
+        int res = this.name.compareTo(o.name);
+        if(res == 0) res = this.age.compareTo(o.age);
+        return res;
+    }
+    
+    
+}
diff --git a/java/samples/file/FileReaderAndWriter.java b/java/samples/file/FileReaderAndWriter.java
new file mode 100644
index 0000000..654622e
--- /dev/null
+++ b/java/samples/file/FileReaderAndWriter.java
@@ -0,0 +1,60 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package filereaderandwriter;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author denis
+ */
+public class FileReaderAndWriter {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        File file = new File("Text.txt");
+        if(!file.exists()) try {
+            file.createNewFile();
+        } catch (IOException ex) {
+            Logger.getLogger(FileReaderAndWriter.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        
+        if(file.canWrite()){
+            
+            String line = "Hello world!";
+            try (FileWriter writer = new FileWriter(file, true)) {
+                writer.append("\n" + line);
+            } catch (IOException ex) {
+                Logger.getLogger(FileReaderAndWriter.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        
+        }
+        
+        if(file.canRead()){
+            String line = "";
+            try(FileReader reader = new FileReader(file)){
+                
+                char[]buf = new char[5];
+                int c =0;
+                while((c=reader.read(buf))!=-1){
+                    line += new String(buf, 0, c);
+                }
+                
+            }catch (IOException ex) {
+                Logger.getLogger(FileReaderAndWriter.class.getName()).log(Level.SEVERE, null, ex);
+            }
+            System.out.println(line);
+        }
+    }
+    
+}
diff --git a/java/samples/file/FileReaderAndWriter2.java b/java/samples/file/FileReaderAndWriter2.java
new file mode 100644
index 0000000..b7f45ae
--- /dev/null
+++ b/java/samples/file/FileReaderAndWriter2.java
@@ -0,0 +1,49 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package filereaderandwriter2;
+
+import java.io.File;
+import java.io.*;
+import java.io.IOException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author denis
+ */
+public class FileReaderAndWriter2 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        File file = new File("SameFile.txt");
+        if(!file.exists()) try {
+            file.createNewFile();
+        } catch (IOException ex) {
+            Logger.getLogger(FileReaderAndWriter2.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        
+        String message = "Hello world";
+        try (FileWriter writer = new FileWriter(file, true)) {
+            writer.append("\n" + message);
+        } catch (IOException ex) {
+        }
+        
+        try(FileReader reader = new FileReader(file)){
+            StringBuffer buffer = new StringBuffer();
+            char[] cbuf = new char[1024];
+            int count = 0;
+            while((count = reader.read(cbuf)) != -1){
+                buffer.append(new String(cbuf, 0, count));
+            }
+            System.out.println(buffer.toString());
+        }catch(IOException e) {}
+        
+    }
+    
+}
diff --git a/java/samples/pecs/City.java b/java/samples/pecs/City.java
new file mode 100644
index 0000000..ed78e8b
--- /dev/null
+++ b/java/samples/pecs/City.java
@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs;
+
+/**
+ *
+ * @author denis
+ */
+public class City extends Country{
+    
+}
diff --git a/java/samples/pecs/Country.java b/java/samples/pecs/Country.java
new file mode 100644
index 0000000..49421e1
--- /dev/null
+++ b/java/samples/pecs/Country.java
@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs;
+
+/**
+ *
+ * @author denis
+ */
+public class Country {
+    
+}
diff --git a/java/samples/pecs/District.java b/java/samples/pecs/District.java
new file mode 100644
index 0000000..a82bf62
--- /dev/null
+++ b/java/samples/pecs/District.java
@@ -0,0 +1,17 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs;
+
+/**
+ *
+ * @author denis
+ */
+public class District extends City{
+    
+    public void methods(){
+        
+    }
+}
diff --git a/java/samples/pecs/RulesPECS.java b/java/samples/pecs/RulesPECS.java
new file mode 100644
index 0000000..cfeaca7
--- /dev/null
+++ b/java/samples/pecs/RulesPECS.java
@@ -0,0 +1,62 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author denis
+ */
+public class RulesPECS {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        RulesPECS rules = new RulesPECS();
+        
+        List<Country> countrys = new ArrayList<>();
+        countrys.add(new Country());
+        List<City> citys = new ArrayList<>();
+        citys.add(new City());
+        List<District> districts = new ArrayList<>();
+        districts.add(new District());
+        List<Street> streets = new ArrayList<>();
+        streets.add(new Street());
+        
+        rules.producer(countrys);
+        rules.producer(citys);
+        rules.producer(districts);
+        rules.producer(streets);
+        
+        rules.consumer(countrys);
+        rules.consumer(citys);
+        rules.consumer(districts);
+        rules.consumer(streets);
+    }
+    
+    public void producer (List<? extends District> list){
+        list.add(new Country());
+        list.add(new City());
+        list.add(new District());
+        list.add(new Street());
+    }
+    
+    public void consumer (List<? super District> list){
+        Object district = list.get(0);
+        if(district instanceof Country) System.out.println("Object is Country");
+        if(district instanceof City) System.out.println("Object is City");
+        if(district instanceof District) System.out.println("Object is District");
+        if(district instanceof Street) System.out.println("Object is Street");
+        list.add(new Country());
+        list.add(new City());
+        list.add(new District());
+        list.add(new Street());
+    }
+    
+}
diff --git a/java/samples/pecs/Street.java b/java/samples/pecs/Street.java
new file mode 100644
index 0000000..53a068e
--- /dev/null
+++ b/java/samples/pecs/Street.java
@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs;
+
+/**
+ *
+ * @author denis
+ */
+public class Street extends District{
+    
+}
diff --git a/java/samples/pecs/rulespecs2/City.java b/java/samples/pecs/rulespecs2/City.java
new file mode 100644
index 0000000..11f7a05
--- /dev/null
+++ b/java/samples/pecs/rulespecs2/City.java
@@ -0,0 +1,26 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs2;
+
+/**
+ *
+ * @author denis
+ */
+public class City extends Country{
+    protected String nameCity;
+
+    public City(String nameCity, String nameCountry) {
+        super(nameCountry);
+        this.nameCity = nameCity;
+    }
+
+    @Override
+    public String toString() {
+        return "City{" + "nameCountry=" + nameCountry + "nameCity=" + nameCity + '}';
+    }
+
+    
+}
diff --git a/java/samples/pecs/rulespecs2/Country.java b/java/samples/pecs/rulespecs2/Country.java
new file mode 100644
index 0000000..5871b19
--- /dev/null
+++ b/java/samples/pecs/rulespecs2/Country.java
@@ -0,0 +1,25 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs2;
+
+/**
+ *
+ * @author denis
+ */
+public class Country {
+    protected String nameCountry;
+
+    public Country(String nameCountry) {
+        this.nameCountry = nameCountry;
+    }
+
+    @Override
+    public String toString() {
+        return "Country{" + "nameCountry=" + nameCountry + '}';
+    }
+
+    
+}
diff --git a/java/samples/pecs/rulespecs2/District.java b/java/samples/pecs/rulespecs2/District.java
new file mode 100644
index 0000000..03ee1c7
--- /dev/null
+++ b/java/samples/pecs/rulespecs2/District.java
@@ -0,0 +1,27 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs2;
+
+/**
+ *
+ * @author denis
+ */
+public class District extends City{
+    
+    protected String nameDistrict;
+
+    public District(String nameDistrict, String nameCity, String nameCountry) {
+        super(nameCity, nameCountry);
+        this.nameDistrict = nameDistrict;
+    }
+
+    @Override
+    public String toString() {
+        return "District{" + "nameCountry=" + nameCountry + "nameCity=" + nameCity + "nameDistrict=" + nameDistrict + '}';
+    }
+
+    
+}
diff --git a/java/samples/pecs/rulespecs2/RulesPECS2.java b/java/samples/pecs/rulespecs2/RulesPECS2.java
new file mode 100644
index 0000000..4f822eb
--- /dev/null
+++ b/java/samples/pecs/rulespecs2/RulesPECS2.java
@@ -0,0 +1,52 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs2;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author denis
+ */
+public class RulesPECS2 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        RulesPECS2 pecs = new RulesPECS2();
+        List<Country> countrys = new ArrayList<>();
+        pecs.consumerCity(countrys);
+        pecs.consumerStreet(countrys);
+        pecs.consumerDistrict(countrys);
+        
+        countrys.forEach(System.out::println);
+    }
+    
+    
+    public void producer(List<? extends District> list){
+
+    }
+    
+    public void consumerStreet(List<? super Street> list){
+        list.add(new Street("Ленинский пр.", "Кировский", "Санкт-Петербург", "Россия"));
+        list.add(new Street("Московский пр.", "Московский", "Санкт-Петербург", "Россия"));
+        list.add(new Street("Стачек пр.", "Кировский", "Санкт-Петербург", "Россия"));
+    }
+    
+    public void consumerDistrict(List<? super District> list){
+        list.add(new District("Невский", "Санкт-Петербург", "Россия"));
+    }
+    
+    public void consumerCity(List<? super City> list){
+        list.add(new City("Санкт-Петербург", "Россия"));
+    }
+    
+    public void method(List<District> list){
+        
+    }
+}
diff --git a/java/samples/pecs/rulespecs2/Street.java b/java/samples/pecs/rulespecs2/Street.java
new file mode 100644
index 0000000..71894e6
--- /dev/null
+++ b/java/samples/pecs/rulespecs2/Street.java
@@ -0,0 +1,30 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package rulespecs2;
+
+/**
+ *
+ * @author denis
+ */
+public class Street extends District{
+    
+    protected String nameStreet;
+
+    public Street(String nameStreet, String nameDistrict, String nameCity, String nameCountry) {
+        super(nameDistrict, nameCity, nameCountry);
+        this.nameStreet = nameStreet;
+    }
+
+    @Override
+    public String toString() {
+        return "Street{" + "nameCountry=" + nameCountry + "nameCity=" + nameCity + "nameDistrict=" + nameDistrict + "nameStreet=" + nameStreet + '}';
+    }
+
+    
+    
+    
+    
+}
diff --git a/java/samples/properties/PropertiesExample.java b/java/samples/properties/PropertiesExample.java
new file mode 100644
index 0000000..d35140f
--- /dev/null
+++ b/java/samples/properties/PropertiesExample.java
@@ -0,0 +1,57 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesexample;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Properties;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author denis
+ */
+public class PropertiesExample {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        File fileProp = new File("prop.properties");
+        if(!fileProp.exists()) try {
+            fileProp.createNewFile();
+        } catch (IOException ex) {
+            Logger.getLogger(PropertiesExample.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        
+        Properties properties = new Properties();
+        try {
+            properties.load(new FileReader(fileProp));
+        } catch (FileNotFoundException ex) {
+            Logger.getLogger(PropertiesExample.class.getName()).log(Level.SEVERE, null, ex);
+        } catch (IOException ex) {
+            Logger.getLogger(PropertiesExample.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        
+//        properties.put("key", "key value");
+//        properties.put("key", "key value2");
+//        properties.put("key2", "key value2");
+        
+        System.out.println(properties.getProperty("nameK", "Key is not exist"));
+        
+        try {
+            properties.store(new FileWriter(fileProp), null);
+        } catch (IOException ex) {
+            Logger.getLogger(PropertiesExample.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        
+    }
+    
+}
diff --git a/java/samples/properties/swing1/AuthorizationFrame.java b/java/samples/properties/swing1/AuthorizationFrame.java
new file mode 100644
index 0000000..ba42407
--- /dev/null
+++ b/java/samples/properties/swing1/AuthorizationFrame.java
@@ -0,0 +1,99 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing;
+
+import java.awt.BorderLayout;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.FlowLayout;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.GridLayout;
+import java.util.List;
+import java.util.Set;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JPasswordField;
+import javax.swing.JTextField;
+
+/**
+ *
+ * @author denis
+ */
+public class AuthorizationFrame extends JFrame{
+    
+    
+    
+    public AuthorizationFrame(){
+        init();
+        setTitle("Authorization");
+        setLocationRelativeTo(null);
+        setSize(400, 250);
+        //pack();
+        setResizable(false);
+        
+        setVisible(true);
+    }
+    
+    private void init(){
+        // Создаём верхнюю метку "Autorization"  и размещаем её в панели "northPanel"
+        JPanel northPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 40, 20));
+        JLabel authLabel = new JLabel("Authorization");
+        northPanel.add(authLabel);
+        
+        GridBagLayout gridLayout = new GridBagLayout();
+        GridBagConstraints constraints = new GridBagConstraints();
+        JPanel centerPanel = new JPanel(gridLayout);
+        JLabel usernameLabel = new JLabel("username");
+        JTextField usernameField = new JTextField(30);
+        JLabel passwordLabel = new JLabel("password");
+        JPasswordField passwordField = new JPasswordField(30);
+        constraints.gridx = 0;
+        constraints.gridy = 0;
+        centerPanel.add(usernameLabel, constraints);
+        constraints.gridx = 1;
+        constraints.gridy = 0;
+        centerPanel.add(usernameField, constraints);
+        constraints.gridx = 0;
+        constraints.gridy = 1;
+        centerPanel.add(passwordLabel, constraints);
+        constraints.gridx = 1;
+        constraints.gridy = 1;
+        centerPanel.add(passwordField, constraints);
+        
+        //Создаём две кнопки "SingIn" и "Cancel" и размещаем их в панели "southPanel"
+        JButton singinButton = new JButton("SingIn");
+        singinButton.addActionListener(e -> {
+            Set<Person> persons = PersonStore.getPersonStore().getPersons();
+            persons.forEach(person -> {
+                if(usernameField.getText().equals(person.getUsername()) &&
+                        passwordField.getText().equals(person.getPassword())){
+                    new MainFrame();
+                }
+            });
+        });
+        JButton cancelButton = new JButton("Cancel");
+        cancelButton.addActionListener(e -> {
+            System.exit(0);
+        });
+        JPanel southPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 40, 20));
+        southPanel.add(singinButton);
+        southPanel.add(cancelButton);
+        
+        
+        //Помещаем панели в главном контейнере
+        getContentPane().setLayout(new BorderLayout());
+        getContentPane().add(northPanel, BorderLayout.NORTH);
+        getContentPane().add(centerPanel, BorderLayout.CENTER);
+        getContentPane().add(southPanel, BorderLayout.SOUTH);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+    }
+    
+    
+    
+}
diff --git a/java/samples/properties/swing1/MainFrame.java b/java/samples/properties/swing1/MainFrame.java
new file mode 100644
index 0000000..675ebb7
--- /dev/null
+++ b/java/samples/properties/swing1/MainFrame.java
@@ -0,0 +1,124 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing;
+
+import java.awt.Container;
+import java.awt.FlowLayout;
+import java.awt.GridLayout;
+import java.awt.Label;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Properties;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.JButton;
+import javax.swing.JFileChooser;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+/**
+ *
+ * @author denis
+ */
+public class MainFrame extends JFrame{
+    
+    private File file;
+    private Properties properties;
+    private JTextField currentField = new JTextField(50);
+    private JTextField powerField = new JTextField(50);
+    private JTextField frecField = new JTextField(50);
+    
+    public MainFrame(){
+        setTitle("Propetries");
+        setSize(600, 600);
+        Container container = getContentPane();
+        GridLayout layout = new GridLayout(0, 1);
+        container.setLayout(layout);
+        container.add(initManageButtons());
+        container.add(initFields("Current: ", currentField));
+        container.add(initFields("Power: ", powerField));
+        container.add(initFields("Frec: ", frecField));
+        
+        setLocationRelativeTo(null);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        pack();
+        setVisible(true);
+    }
+    
+    private JPanel initFields(String textLabel, JTextField field){
+        JPanel panel = new JPanel(new FlowLayout());
+        JLabel label = new JLabel(textLabel);
+        panel.add(label);
+        panel.add(field);
+        return panel;
+    }
+    
+    private void initFileChooser(){
+        JFileChooser chooser = new JFileChooser();
+        chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
+        int result = chooser.showOpenDialog(this);
+        if(result == JFileChooser.APPROVE_OPTION){
+            file = chooser.getSelectedFile();
+        }
+    }
+    
+    private JPanel initManageButtons(){
+        JPanel panel = new JPanel(new FlowLayout(10, 20, 20));
+        JButton openButton = new JButton("Open file");
+        panel.add(openButton);
+        openButton.addActionListener(e -> {
+            initFileChooser();
+            if(file!=null && file.exists() && file.canRead()){
+                loadProperties();
+                if(properties!=null) {
+                    if(currentField!=null) currentField.setText(properties.getProperty("Current"));
+                    if(powerField!=null) powerField.setText(properties.getProperty("Power"));
+                    if(frecField!=null) frecField.setText(properties.getProperty("Frec"));
+                }
+            }
+        });
+        JButton saveButton = new JButton("Save file");
+        panel.add(saveButton);
+        saveButton.addActionListener(e -> {
+            if(file!=null && properties!=null){
+                properties.put("Current", currentField.getText());
+                properties.put("Power", powerField.getText());
+                properties.put("Frec", frecField.getText());
+                saveProperties();
+            }
+        });
+        return panel;
+    }
+    
+    
+    
+    private void loadProperties(){
+        properties = new Properties();
+        try {
+            properties.load(new FileReader(file));
+        } catch (FileNotFoundException ex) {
+            Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+        } catch (IOException ex) {
+            Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+    
+    private void saveProperties(){
+        if(properties!=null){
+            try {
+                properties.store(new FileWriter(file), null);
+            } catch (IOException ex) {
+                Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        }
+    }
+    
+}
diff --git a/java/samples/properties/swing1/Person.java b/java/samples/properties/swing1/Person.java
new file mode 100644
index 0000000..24fb5e3
--- /dev/null
+++ b/java/samples/properties/swing1/Person.java
@@ -0,0 +1,74 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+/**
+ *
+ * @author denis
+ */
+public class Person implements Serializable{
+    
+    
+    
+    private String username;
+    private String password;
+
+    public Person(String username, String password) {
+        this.username = username;
+        this.password = password;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    @Override
+    public String toString() {
+        return "Person{" + "username=" + username + ", password=" + password + '}';
+    }
+
+    @Override
+    public int hashCode() {
+        int hash = 3;
+        hash = 67 * hash + Objects.hashCode(this.username);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final Person other = (Person) obj;
+        if (!Objects.equals(this.username, other.username) && hashCode()!=Objects.hashCode(obj)) {
+            return false;
+        }
+        return true;
+    }
+    
+    
+}
diff --git a/java/samples/properties/swing1/PersonStore.java b/java/samples/properties/swing1/PersonStore.java
new file mode 100644
index 0000000..5ad3cca
--- /dev/null
+++ b/java/samples/properties/swing1/PersonStore.java
@@ -0,0 +1,76 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author denis
+ */
+public final class PersonStore {
+    private static Set<Person> persons = new HashSet<>();
+    private static PersonStore personStore;
+    private File file;
+    
+    private PersonStore(){
+        file = new File("persons.txt");
+        if(!file.exists()) try {
+            file.createNewFile();
+        } catch (IOException ex) {
+            Logger.getLogger(PropertiesSwing.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        readStore();
+    }
+    
+    public static PersonStore getPersonStore(){
+        if (personStore == null) personStore = new PersonStore();
+        return personStore;
+    }
+    
+    public void addPerson(Person person){
+        persons.add(person);
+        saveStore();
+    }
+    
+    public HashSet<Person> getPersons(){
+        return new HashSet<>(persons);
+    }
+    
+    private void readStore(){
+        if(file==null || !file.canRead()) return;
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file))) {
+            Object result = ois.readObject();
+            persons = result!=null ? (HashSet<Person>)result : new HashSet<>();
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+    }
+    
+    private void saveStore(){
+        if(file==null || !file.canRead()) return;
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file))) {
+            oos.writeObject(persons);
+        } catch (FileNotFoundException ex) {
+            Logger.getLogger(PropertiesSwing.class.getName()).log(Level.SEVERE, null, ex);
+        } catch (IOException ex) {
+            Logger.getLogger(PropertiesSwing.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+}
diff --git a/java/samples/properties/swing1/PropertiesSwing.java b/java/samples/properties/swing1/PropertiesSwing.java
new file mode 100644
index 0000000..19f2411
--- /dev/null
+++ b/java/samples/properties/swing1/PropertiesSwing.java
@@ -0,0 +1,31 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing;
+
+/**
+ *
+ * @author denis
+ */
+public class PropertiesSwing {
+    
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        
+//        PersonStore personStore = PersonStore.getPersonStore();
+//        personStore.addPerson(new Person("Andrey", "Andrey"));
+        javax.swing.SwingUtilities.invokeLater(new Runnable() {
+               public void run() {
+                    new AuthorizationFrame();
+               }
+          });
+        //new AuthorizationFrame();
+    }
+    
+    
+}
diff --git a/java/samples/properties/swing2/AuthenticationFrame.java b/java/samples/properties/swing2/AuthenticationFrame.java
new file mode 100644
index 0000000..14daae8
--- /dev/null
+++ b/java/samples/properties/swing2/AuthenticationFrame.java
@@ -0,0 +1,104 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing2;
+
+import java.awt.Container;
+import java.awt.FlowLayout;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.HeadlessException;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.JMenuItem;
+import javax.swing.JPanel;
+import javax.swing.JPasswordField;
+import javax.swing.JTextField;
+
+/**
+ *
+ * @author denis
+ */
+public class AuthenticationFrame extends JFrame{
+
+    public AuthenticationFrame() {
+        
+        setTitle("Authentication");
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        init();
+        setSize(500, 200);
+        setResizable(false);
+        setLocationRelativeTo(null);
+        //pack();
+        setVisible(true);
+    }
+
+    private void init() {
+        JMenuBar bar = new JMenuBar();
+        setJMenuBar(bar);
+        JMenu menu = new JMenu("File");
+        bar.add(menu);
+        JMenuItem openItem = new JMenuItem("Open");
+        JMenuItem closeItem = new JMenuItem("Close");
+        menu.add(openItem);
+        menu.add(closeItem);
+        closeItem.addActionListener(e -> {
+            System.exit(0);
+        });
+                
+        
+        
+        GridBagLayout gbl = new GridBagLayout();
+        GridBagConstraints constraints = new GridBagConstraints();
+        Container container = getContentPane();
+        container.setLayout(gbl);
+        
+        
+        constraints.gridx = 1;
+        constraints.gridy = 0;
+        JLabel authLabel = new JLabel("Authorization");
+        container.add(authLabel, constraints);
+        
+        JLabel usernameLanbel = new JLabel("username");
+        JTextField usernameText = new JTextField(30);
+        constraints.gridx = 0;
+        constraints.gridy = 1;
+        container.add(usernameLanbel, constraints);
+        constraints.gridx = 1;
+        constraints.gridy = 1;
+        container.add(usernameText, constraints);
+        
+        JLabel passwordLanbel = new JLabel("password");
+        JPasswordField passwordText = new JPasswordField(30);
+        constraints.gridx = 0;
+        constraints.gridy = 2;
+        container.add(passwordLanbel, constraints);
+        constraints.gridx = 1;
+        constraints.gridy = 2;
+        container.add(passwordText, constraints);
+        
+        JButton singIn = new JButton("SingIn");
+        JButton cancel = new JButton("Cancel");
+        JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER, 30, 5));
+        constraints.gridx = 1;
+        constraints.gridy = 3;
+        container.add(panel, constraints);
+        panel.add(singIn);
+        panel.add(cancel);
+        
+        singIn.addActionListener(e -> {
+            UserCheck check = new UserCheck();
+            if(check.check(usernameText.getText(), passwordText.getText())) System.out.println("Авторизация успешна");
+            else System.out.println("Имя пользователя или пароль не верны");
+        });
+        
+        cancel.addActionListener(e -> {
+            System.exit(0);
+        });
+    }
+}
diff --git a/java/samples/properties/swing2/MainFrame.java b/java/samples/properties/swing2/MainFrame.java
new file mode 100644
index 0000000..97a7e1f
--- /dev/null
+++ b/java/samples/properties/swing2/MainFrame.java
@@ -0,0 +1,162 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing2;
+
+import java.awt.*;
+import java.awt.event.ActionListener;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Properties;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+/**
+ *
+ * @author denis
+ */
+public class MainFrame extends JFrame{
+    private Properties property;
+    private File file;
+    private JTextField urlField;
+    private JTextField usernameField;
+    private JTextField passwordField;
+    
+    public MainFrame(){
+        setTitle("Properties");
+        Container root = getContentPane();
+        root.setLayout(new BorderLayout(20, 20));
+        
+        //Добавляем группу кнопок
+        root.add(createButtons(), BorderLayout.NORTH);
+        //Добавляем группу меток и текстовых полей
+        root.add(createDataArea());
+        
+        
+        setSize(800, 300);
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        setLocationRelativeTo(null);
+        setResizable(false);
+        setVisible(true);
+    }
+    
+    private JPanel createButtons(){
+        JPanel panel = new JPanel(new FlowLayout());
+        JButton loadButton = new JButton("LOAD");
+        JButton saveButton = new JButton("SAVE");
+        panel.add(loadButton);
+        panel.add(saveButton);
+        
+        loadButton.addActionListener(e -> {
+            loadProperties();
+            if(property!=null){
+                if (urlField!=null) urlField.setText(property.getProperty("URL", ""));
+                if (usernameField!=null) usernameField.setText(property.getProperty("username", ""));
+                if (passwordField!=null) passwordField.setText(property.getProperty("password", ""));
+            }
+        });
+        
+        saveButton.addActionListener(e -> {
+            String url = urlField!=null ? urlField.getText() : "";
+            String username = usernameField!=null ? usernameField.getText() : "";
+            String password = passwordField!=null ? passwordField.getText() : "";
+            if(property!=null){
+                property.put("URL", url);
+                property.put("username", username);
+                property.put("password", password);
+            }
+            saveProperties();
+        });
+        
+        return panel;
+    }
+    
+    private JPanel createDataArea(){
+        JPanel panel = new JPanel(new GridBagLayout());
+        GridBagConstraints constraints = new GridBagConstraints();
+        
+        JLabel urlLabel = new JLabel("URL:");
+        urlField = new JTextField(50);
+        
+        constraints.gridx = 0;
+        constraints.gridy = 0;
+        panel.add(urlLabel, constraints);
+        
+        constraints.gridx = 1;
+        constraints.gridy = 0;
+        panel.add(urlField, constraints);
+        
+        JLabel usernameLabel = new JLabel("username:");
+        usernameField = new JTextField(50);
+        
+        constraints.gridx = 0;
+        constraints.gridy = 1;
+        panel.add(usernameLabel, constraints);
+        
+        constraints.gridx = 1;
+        constraints.gridy = 1;
+        panel.add(usernameField, constraints);
+        
+        JLabel passwordLabel = new JLabel("password:");
+        passwordField = new JTextField(50);
+        
+        constraints.gridx = 0;
+        constraints.gridy = 2;
+        panel.add(passwordLabel, constraints);
+        
+        constraints.gridx = 1;
+        constraints.gridy = 2;
+        panel.add(passwordField, constraints);
+        
+        return panel;
+    }
+    
+    private void loadProperties(){
+        property = new Properties();
+        if(file==null) file = new File("C:\\PropDir\\prop2.properties");
+        //Проверяем существование файла
+        if(!file.exists()) { 
+            try {
+                file.createNewFile();
+            } catch (IOException ex) {
+                Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        } else {
+            if(file.canRead()){
+                try (FileReader reader = new FileReader(file)) {
+                    property.load(reader);
+                } catch (FileNotFoundException ex) {
+                    Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+                } catch (IOException ex) {
+                    Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+                }
+            }
+        }
+    }
+    
+    private void saveProperties(){
+        if(file==null) file = new File("C:\\PropDir\\prop2.properties");
+        if(!file.exists()) try {
+            file.createNewFile();
+        } catch (IOException ex) {
+            Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        if(file.canWrite()){
+            try (FileWriter writer = new FileWriter(file)) {
+                property.store(writer, null);
+            } catch (IOException ex) {
+                Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        }
+    }
+}
diff --git a/java/samples/properties/swing2/PersonStore.java b/java/samples/properties/swing2/PersonStore.java
new file mode 100644
index 0000000..60c9054
--- /dev/null
+++ b/java/samples/properties/swing2/PersonStore.java
@@ -0,0 +1,72 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing2;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author denis
+ */
+public class PersonStore {
+    private static Set<User> persons = new HashSet<>();
+    private static PersonStore personStore;
+    private File file;
+    
+    private PersonStore(){
+        file = new File("persons.txt");
+        if(!file.exists()) try {
+            file.createNewFile();
+        } catch (IOException ex) {
+            ex.printStackTrace();
+        }else readStore();
+    }
+    
+    public static PersonStore getPersonStore(){
+        if (personStore == null) personStore = new PersonStore();
+        return personStore;
+    }
+    
+    public void addUser(User user){
+        persons.add(user);
+        saveStore();
+    }
+    
+    public HashSet<User> getPersons(){
+        return new HashSet<>(persons);
+    }
+    
+    private void readStore(){
+        if(file==null || !file.canRead()) return;
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file))) {
+            Object result = ois.readObject();
+            persons = result!=null ? (HashSet<User>)result : new HashSet<>();
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+    }
+    
+    private void saveStore(){
+        if(file==null || !file.canRead()) return;
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file))) {
+            oos.writeObject(persons);
+        } catch (FileNotFoundException ex) {
+            ex.printStackTrace();
+        } catch (IOException ex) {
+            ex.printStackTrace();
+        }
+    }
+}
diff --git a/java/samples/properties/swing2/PropertiesSwing2.java b/java/samples/properties/swing2/PropertiesSwing2.java
new file mode 100644
index 0000000..e84c61f
--- /dev/null
+++ b/java/samples/properties/swing2/PropertiesSwing2.java
@@ -0,0 +1,25 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing2;
+
+/**
+ *
+ * @author denis
+ */
+public class PropertiesSwing2 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        PersonStore store = PersonStore.getPersonStore();
+        store.getPersons().forEach(System.out::println);
+        //new MainFrame();
+        
+        new AuthenticationFrame();
+    }
+    
+}
diff --git a/java/samples/properties/swing2/User.java b/java/samples/properties/swing2/User.java
new file mode 100644
index 0000000..afdc345
--- /dev/null
+++ b/java/samples/properties/swing2/User.java
@@ -0,0 +1,67 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing2;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+/**
+ *
+ * @author denis
+ */
+public class User implements Serializable{
+    private String username;
+    private String password;
+
+    public User(String username, String password) {
+        this.username = username;
+        this.password = password;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+    
+    @Override
+    public int hashCode() {
+        int hash = 3;
+        hash = 53 * hash + Objects.hashCode(this.username);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final User other = (User) obj;
+        if (!Objects.equals(this.username, other.username)) {
+            return false;
+        }
+        if (!Objects.equals(this.hashCode(), other.hashCode()) ) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "username=" + username + ", password=" + password + '}';
+    }
+    
+    
+    
+}
diff --git a/java/samples/properties/swing2/UserCheck.java b/java/samples/properties/swing2/UserCheck.java
new file mode 100644
index 0000000..4b57841
--- /dev/null
+++ b/java/samples/properties/swing2/UserCheck.java
@@ -0,0 +1,21 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package propertiesswing2;
+
+/**
+ *
+ * @author denis
+ */
+public class UserCheck {
+    
+    public boolean check(String username, String password){
+        if(username==null || username.isEmpty() || password == null || password.isEmpty()) return false;
+        for (User user : PersonStore.getPersonStore().getPersons()){
+            if(user.getUsername().equals(username) && user.getPassword().equals(password)) return true;
+        }
+        return false;
+    }
+}
diff --git a/java/samples/swing/dev_j2022_2/Dev_j2022_2.java b/java/samples/swing/dev_j2022_2/Dev_j2022_2.java
new file mode 100644
index 0000000..a26e813
--- /dev/null
+++ b/java/samples/swing/dev_j2022_2/Dev_j2022_2.java
@@ -0,0 +1,34 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package dev_j2022_2;
+
+/**
+ *
+ * @author denis
+ */
+public class Dev_j2022_2 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Device[] devices = new Device[5];
+        String line = " Hello";
+        devices[0]=new ElectronicDevice();
+        devices[1]=new MechanicalDevice();
+        devices[2]=new ElectronicDevice();
+        devices[3]=new MechanicalDevice();
+        devices[4]=new Device();
+        
+        for(int i=0 ; i<devices.length ; i++){
+            devices[i].print();
+        }
+        ElectronicDevice e1 = new ElectronicDevice();
+        Device e2 = new ElectronicDevice();
+        ((ElectronicDevice)e2).setPower(15);
+    }
+    
+}
diff --git a/java/samples/swing/dev_j2022_2/Device.java b/java/samples/swing/dev_j2022_2/Device.java
new file mode 100644
index 0000000..fbb7564
--- /dev/null
+++ b/java/samples/swing/dev_j2022_2/Device.java
@@ -0,0 +1,68 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package dev_j2022_2;
+
+/**
+ *
+ * @author denis
+ */
+public class Device {
+    
+    private int length;
+    private int width;
+    private int height;
+    
+    public Device(){
+        length = 9;
+        width = 9;
+        height = 9;
+    }
+    
+    public Device(int length, int width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    public Device(int length, int width, int height) {
+        this.length = length;
+        this.width = width;
+        this.height = height;
+    }
+    
+    public int getLength(){
+        return length;
+    }
+    public void setLength(int length){
+        if(length>0) this.length = length;
+        else throw new IllegalArgumentException("Значение length должно быть больше 0");
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public void setWidth(int width) {
+        this.width = width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    public void setHeight(int height) {
+        this.height = height;
+    }
+    
+    public void print(){
+        System.out.println("Device: demention=" + length + "/" + width + "/" + height);
+    }
+    
+    public void printAll(Device[] devices){
+        for(int i=0 ; i<devices.length ; i++){
+            devices[i].print();
+        }
+    }
+}
diff --git a/java/samples/swing/dev_j2022_2/ElectronicDevice.java b/java/samples/swing/dev_j2022_2/ElectronicDevice.java
new file mode 100644
index 0000000..7a1a353
--- /dev/null
+++ b/java/samples/swing/dev_j2022_2/ElectronicDevice.java
@@ -0,0 +1,48 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package dev_j2022_2;
+
+/**
+ *
+ * @author denis
+ */
+public class ElectronicDevice extends Device{
+    private int current;
+    private int voltage;
+    private int power;
+
+    @Override
+    public void print() {
+        System.out.println("Device: demention=" + getLength() + "/" + getWidth() + "/" + getHeight() + 
+                ", electronicCharacter=" + voltage + "V");
+    }
+
+    public int getCurrent() {
+        return current;
+    }
+
+    public void setCurrent(int current) {
+        this.current = current;
+    }
+
+    public int getVoltage() {
+        return voltage;
+    }
+
+    public void setVoltage(int voltage) {
+        this.voltage = voltage;
+    }
+
+    public int getPower() {
+        return power;
+    }
+
+    public void setPower(int power) {
+        this.power = power;
+    }
+    
+    
+}
diff --git a/java/samples/swing/dev_j2022_2/MechanicalDevice.java b/java/samples/swing/dev_j2022_2/MechanicalDevice.java
new file mode 100644
index 0000000..a964958
--- /dev/null
+++ b/java/samples/swing/dev_j2022_2/MechanicalDevice.java
@@ -0,0 +1,22 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package dev_j2022_2;
+
+/**
+ *
+ * @author denis
+ */
+public class MechanicalDevice extends Device{
+    private String name = "velo";
+
+    @Override
+    public void print() {
+        System.out.println("Device: demention=" + getLength() + "/" + getWidth() + "/" + getHeight() + 
+                ", typeDevice=" + name);
+    }
+    
+    
+}