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import javax.swing.*;

class First{
    public static void main(String args[]){

        // Creating threads
        Thread t1 = new Thread(new Second("first"));
        Thread t2 = new Thread(new Second("second"));
        Thread t3 = new Thread(new Second("third"));
        Thread t4 = new Thread(new Second("fourth"));

        // Starting the threads
        t1.start();
        t2.start();
        t3.start();
        t4.start();


    }
}

import java.util.Random;

public class Second implements Runnable{

        String name;
        int time;
        Random r = new Random();

        public Second(String x){
            name = x;
            // Picking a random number from 1 to 999
            time = r.nextInt(999);

        }

        // Using the run() method that comes with the Runnable library
        public void run(){
            try{
                // Putting the thread to sleep for a random amount of time
                System.out.printf("%s is sleeping for %d\n", name, time);
                Thread.sleep(time);
                // When the thread wakes up it will print out this
                System.out.printf("%s has woken up\n",name);

                // Exception handling
            }catch(Exception e){
                System.out.println("Error!");
            }
        }

}