test.java

import java.util.concurrent.*;
import java.io.IOException;

class JumbleNames implements Runnable
{
    private String firstName, secondName;
    private long delay;
    public JumbleNames(String firstName, String secondName, long delay)
    {
        this.firstName = firstName;
        this.secondName = secondName;
        this.delay = delay;
    }
    public void run(){
        try{
            System.out.println(firstName);
            TimeUnit.MILLISECONDS.sleep(delay);
            while(true){
                System.out.println(secondName);
            }
        }
        catch(InterruptedException e) {
            System.err.println("Interrupted");
        }
    }
    public static void main(String[] args){
        Thread t1 = new Thread(new JumbleNames("A", "B", 100));
        Thread t2 = new Thread(new JumbleNames("D", "E", 100));
        Thread t3 = new Thread(new JumbleNames("F", "G", 100));
        t1.setDaemon(true);
        t2.setDaemon(true);
        t3.setDaemon(true);
        t1.start();
        t2.start();
        t3.start();
        
        System.out.println("Press Enter when you had enough");
        try{
            System.in.read();
            System.out.println("Enter pressed \n");
        }
        catch(IOException e){
            System.err.println(e);
        }
        System.out.println("Ending main()");
        return;
    }

}