LambdaTest.java

package lambda;

import javax.swing.*;
import java.util.Arrays;
import java.util.Date;

/**
 * This program demonstrates the use of lambda expressions.
 *
 * @author Cay Horstmann
 * @version 1.0 2015-05-12
 */
public class LambdaTest {
    public static void main(String[] args) {
        String[] planets = new String[]{
                "Mercury", "Venus", "Earth", "Mars",
                "Jupiter", "Saturn", "Uranus", "Neptune"
        };
        System.out.println(Arrays.toString(planets));
        System.out.println("Sorted in dictionary order:");
        Arrays.sort(planets);
        System.out.println(Arrays.toString(planets));
        System.out.println("Sorted by length:");
        Arrays.sort(planets, (first, second) ->
                first.length() - second.length());
        System.out.println(Arrays.toString(planets));

        Timer timer = new Timer(1000, event ->
                System.out.println("The time is " + new Date()));
        timer.start();

        // keep program running until user selects "Ok"
        JOptionPane.showMessageDialog(null, "Quit program?");
        System.exit(0);
    }
}