hello/java/samples/java-packages/source/DemoLambda.java

/*
 * 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 std;

import java.util.ArrayList;

/**
 *
 * @author (C)Y.D.Zakovryashin, 05.12.2022
 */
public class DemoLambda {

    public static void main(String[] args) {
        DemoLambda demo = new DemoLambda();
        ArrayList<Integer> al = demo.init();
        demo.print(al);
        al.removeIf((Integer x) -> x % 2 != 0);
        demo.print(al);
        al.forEach((Integer x) -> {
            System.out.print(x * 2 + ", ");
        });
        System.out.println("");
    }

    private ArrayList<Integer> init() {
        int[] ai = {1, 2, 3, 4, 5, 6, 77, 78};
        ArrayList<Integer> al = new ArrayList<>();
        for (int i : ai) {
            al.add(i);
        }
        return al;
    }

    private void a(int x) {

        // new ? implements DemoFunInterface { ... }
        DemoFunInterface d = x1 -> {
            return String.valueOf(x1);
        };
    }

    private void print(ArrayList<Integer> al) {
        for (Integer i : al) {
            System.out.print(i + ", ");
        }
        System.out.println();
    }

}