Running a thread for a specified time

Question

my main program has 10 threads. i want to run each thread for 30 secs . but if one thread is on progress it may be allowed some time to complete its task otherwise evrbody should return after 30 secs.how can i do it ?
thankx

Answer 1

code is hanging...
also how do i do >>if one thread is on progress it may be allowed some time to complete its task otherwise evrbody should return after 30 secs
class Shared
boolean stop=false;
// do nothing but helps only for synchronisation
class ThreadProducer1 extends Thread
{    Shared obj;
     public void run()
     {   long endTime = System.currentTimeMillis() + 30 * 1000;
         long currentTime;
          for (int k=0;k<1000;k++)
          {System.out.println("thread1");     // doing its work
         currentTime=System.currentTimeMillis();
          if (currentTime>endTime) break;
class ThreadProducer2 extends Thread
{   Shared obj;
     public void run()
     {   long endTime = System.currentTimeMillis() + 30 * 1000;
         long currentTime;
          for (int k=0;k<1000;k++){
          System.out.println("thread2");     // doing its work
          currentTime=System.currentTimeMillis();
          if (currentTime>endTime) break;}     // doing its work
class ThreadProducer3 extends Thread
{   Shared obj;
     public void run()
     {   long endTime = System.currentTimeMillis() + 30 * 1000;
         long currentTime;
          for (int k=0;k<1000;k++)
          System.out.println("thread 3");     // doing its work
          currentTime=System.currentTimeMillis();
          if (currentTime>endTime) break;
          }     // doing its work
class Test
public static void main(String argv[])
    try{
     ThreadProducer1 t1 = new ThreadProducer1();
     ThreadProducer2 t2 = new ThreadProducer2();
     ThreadProducer3 t3 = new ThreadProducer3();
     t1.start();
    t2.start();
     t3.start();
    Thread.sleep(30000); // main thread wakes up after 30 secs.
     }catch (InterruptedException ex)
         System.out.println("exception");