Multiple threads access the same method.

Question

Hello,
I have been trying for a long time to find out multiple threads access the shared data.
I have written a sample code, there I my intention is that method has to be accessed
onlny one thread at a time., mean one thread finished the job, then next thread can
access the shared source. But for this code I am not getting the desired out put what I want. But if I am using synchronized block I am getting the output. Please correct where I got mistake. Please see my code.
public class TestThread implements Runnable {
     Shared r;
     public TestThread() {
          r = new Shared();
     public static void main(String args[]) {
          Thread t1 = new Thread(new TestThread());
          Thread t2 = new Thread(new TestThread());
          t1.setName("A");
          t2.setName("B");
          t1.start();
          t2.start();
      * (non-Javadoc)
      * @see java.lang.Runnable#run()
     @Override
     public void run() {
          // TODO Auto-generated method stub
          r.count();
class Shared {
     public synchronized void count() {
          String name = Thread.currentThread().getName();
          System.out.println(name + ":accessed...");
          try {
               for (int i = 0; i < 5; i++) {
                    System.out.println(name + ": " + i);
          } catch (Exception e) {
               // TODO: handle exception
}Thanks
Bhanu lakshmi.

Answer 1

It depends on what you synchronize. Non-static methods synchronize on the object, so if you're using several objects, you'll be able to call each from their own thread.
Make your method synchronized or use only a single object and see the difference.