Using a synchronized block

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Using a synchronized block
Posted on: June 25, 2010 at 12:00 AM

Every Class loaded and every Java object you create have an associated lock or monitor. When code are kept in a synchronized block makes the compiler append instruction to acquire the lock on the specified object before it executes the code and release it afterward.

Description:

This tutorial demonstrate how to implement synchronized block. In multithreading application a synchronized block is used to acquires the lock for an object.

Code:


class Called {

  void calling(String msg) {

    System.out.print("<" + msg);

    try {

      Thread.sleep(2000);

    } catch (InterruptedException e) {

      System.out.println("Interrupted "+e);

    }

    System.out.print(">");

  }

}

	

class Caller implements Runnable {

  String msg;

  Called target;

  Thread t;

	

  public Caller(Called targ, String s) {

    target = targ;

    msg = s;

    t = new Thread(this);

    t.start();

  }

	

  public void run() {

    synchronized (target) { 

      target.calling(msg);

    }

  }

}

	

class SynchBlock {

  public static void main(String args[]) {

    Called target = new Called();

    Caller ob1 = new Caller(target, "First");

    Caller ob2 = new Caller(target, "Second");

    Caller ob3 = new Caller(target, "Third");

	

    try {

      ob1.t.join();

      ob2.t.join();

      ob3.t.join();

    } catch (InterruptedException e) {

      System.out.println("Interrupted "+e);

    }

  }

}

Output:

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