//Threads3.java

import java.util.*;

class Z implements Runnable {      //change from X because X.class differs...
    public void run() {   
	while (true) {
	    System.out.println( "hi from " + 
				Thread.currentThread().getName() );
	    
	    try {
		Thread.sleep( (int)(Math.random()*2000) + 2000 );
	    }
	    catch (InterruptedException e) {}  
	    
	}
    }
}


public class Threads3 {
    public static int JOBS=4;
    public static int THREADS=12;

    public static void main( String[] args ) {

	String[] names = {"gilligan", "skipper", "millionaire", "his wife",
			  "movie star", "professor", "maryann" };

	List zList = new ArrayList();
	Set threadSet = new HashSet();
	Z z1;
	Thread t1;

	for (int i=1; i<=JOBS; i++) {
	    z1 = new Z();    //a runnable job (object)
	    zList.add( z1 );  //put reference to it into list
	}
	for (int i=1; i<=THREADS; i++) {
	    //assign random job to thread
	    t1 = new Thread( (Z) zList.get( (int)(Math.random()*JOBS) ) );
	    //give it a random name:
	    //t1.setName( names[(int)(Math.random()*names.length)] );
	    //dump it into the set of Threads
	    threadSet.add( t1 );
	    t1.start();   //start it
	}
    }
}