Source Code : Synchronized Block demo

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Synchronized Block demo

     
public class SyncBlock extends Object {
  private Object longLock;

  public SyncBlock() {
    longLock = new Object();
  }

  public void doStuff() {
    print("about to try to get exclusive access " + "to longLock");

    synchronized (longLock) {
      print("got exclusive access to longLock");
      try {
        Thread.sleep(10000);
      } catch (InterruptedException x) {
      }
      print("about to relinquish exclusive access to " + "longLock");
    }
  }

  private static void print(String msg) {
    String name = Thread.currentThread().getName();
    System.err.println(name + ": " + msg);
  }

  private static Thread launch(final SyncBlock sb, String name) {

    Runnable r = new Runnable() {
      public void run() {
        print("in run()");
        sb.doStuff();
      }
    };

    Thread t = new Thread(r, name);
    t.start();

    return t;
  }

  public static void main(String[] args) {
    try {
      SyncBlock sb = new SyncBlock();

      Thread t1 = launch(sb, "T1");
      Thread.sleep(500);

      Thread t2 = launch(sb, "T2");
      Thread t3 = launch(sb, "T3");

      Thread.sleep(1000);

      print("about to interrupt T2");
      t2.interrupt();
      print("just interrupted T2");

    } catch (InterruptedException x) {
      x.printStackTrace();
    }
  }
}

           
         
    
    
    
    
  

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