Problem with very simple 2 threads java application

Question

Hi,
As fa as i'm concerned this is a thread licecycle:
1. thread created: it is dead.
2. thread started: it is now alive.
3. thread executes its run method: it is alive during this method.
4. after thread finishes its run method: it is dead.
No I have simple JUnit code:
public void testThreads() throws Exception {
WorkTest work = new WorkTest() {
public void release() {
// TODO Auto-generated method stub
public void run() {
for (int i=0;i<1000;i++){
log.debug(i+":11111111111");
//System.out.println(i+":11111111111");
WorkTest work2 = new WorkTest() {
public void release() {
// TODO Auto-generated method stub
public void run() {
for (int i=0;i<1000;i++){
log.debug(i+":22222222222");
Thread workerThread = new Thread(work);
Thread workerThread2 = new Thread(work2);
workerThread.start();
//workerThread.join();
workerThread2.start();
//workerThread2.join();
And
public interface WorkTest extends Runnable {
public abstract void release();
And that's it..
On the console I see 999 iterations of both threads only if i uncomment
//workerThread.join();
//workerThread2.join();
In other case I see random number of iterations - JUNIT finishes and Thread1 made 54 and Thread2 233 iterations - the numbers are different every time i start the JUnit..
What I want? Not to wait until the first one finishes - I want them to start at the same time and they must FINISH their tasks...
Please help me asap :(

Answer 1

This is very simple... Look at your code:
workerThread.start();
workerThread.join();
workerThread2.start();
workerThread2.join();What are you doing here? You start the first thread, then you call join(), which waits until it finishes. Then after it's finished, you start the second thread and wait until it finishes. You should simply do this:
workerThread.start();
workerThread2.start();
workerThread.join();
workerThread2.join();I.e., you start the 2 threads and then you wait (first for the first one, then for the second one).