Java Thread synchronization - Thread.sleep() Method Not Working as desired

Question

i heard, sleep() will lock the current sync method/block But here, when i call sleep() on thread 1, thread 2 is able to access the same block? Can anyone Explain?

M

Answer 1

This is because you have two different instances of Syncc in play here. Each thread has its own copy of Syncc.

Try doing the same with a single instance. You could also synchronize on the static context and try.

To simulate, modify Thread1 and Thread2 to accept an instance of Syncc.

public class Thread1 extends Thread {
    private Syncc syncc;

    public Thread1(Syncc syncc) {
        this.syncc = syncc;
    }

    public void run() { 
        this.syncc.me("T1:");
    }   
}

You can then start them as so:

public static void main(String args[]) {
    Syncc syncc = new Syncc();

    Thread1 t1 = new Thread1(syncc);
    Thread2 t2 = new Thread2(syncc);

    System.out.println("going to start t1");
    t1.start();
    System.out.println("going to start t2");
    t2.start();
}