Starting thread numerous times

Question

hi, i got the following code:
public class TestRunnerThread
  extends Thread
  private ThreadCheck test = null;
  public TestRunnerThread()
    test = new ThreadCheck();  // doesn't work - see run method.
  public static void main(
      String[] args_)
    TestRunnerThread runner = new TestRunnerThread();
    runner.start();
  public void run()
    while (true)
      try
        // ::NOTE:: thread only works with new instance - starting old thread
        // doesn't work anymore as soon as the thread leaves it's run method.
        // test = new ThreadCheck();  // this works
        test.start();
        System.out.println("waiting till join...alive:" + test.isAlive());
        test.join();
        System.out.println("sleep...");
        Thread.sleep(3000);
      catch (InterruptedException e)
        e.printStackTrace();
public class ThreadCheck
  extends Thread
  boolean tester = false;
  public ThreadCheck()
    tester = true;
  public void run()
    System.out.println("#test:" + tester);
    System.out.println("#..............");
}the ThreadChecker runs only if more than once if i create a new ThreadChecker object for every loop in the TestRunnerThread run method. although test.isAlive()) returns true even if i initialize the ThreadChecker only once in the TestRunnerThread run method which confuses me. isn't it possible to start the thread again as soon as it left the run method? and if so, why does it still say true for isAlive?
cheers,
mischka

Answer 1

Hi,
A thread that has terminated can't be re-started.
/Kaj