Confused: multiple thread on multiple instances

Question

I was trying to see if multiple threads, each running a different instance of a given class which has a (non-static) synchronized method will force a wait on each thread even though its a different instance. So, I put togeteher the following test class and am now more confused.
First the code.
package test;
import java.util.Date;
public class TestThreads implements Runnable{
     public TestThreads() {
     private synchronized void synchedMethod(long msToWait){
          String myThread = Thread.currentThread().getName();
          System.out.println(new Date() +" synchedMethod(" + msToWait +") " +myThread);
          try {
               wait(msToWait);
          } catch (InterruptedException e) {
               e.printStackTrace();
     public void run() {
          synchedMethod(1000);
     public static void main(String[] args) {
          Thread[] tt = new Thread[5];
          for (int i = 0; i < tt.length; i++) {
               tt[i] = new Thread(new TestThreads());
          for (int i = 0; i < tt.length; i++) {
               tt.run();
Now, in addition to my original unanswered question, why are all the threads showing as being the same?
Thank you;
nat

Answer 1

As already noted you must start() threads - run() is just a normal method call in the current thread.
To answer you question: each object has a distinct monitor lock. If every thread calls the synchronized method of a different instance then no thread will ever find that the lock of its instance is unavailable. Any Java language text that covers threading and synchronization will tell you this.