hello/java/samples/collections/CollectionExample2.java

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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));
    }
    
}