//PROGRAM 12-10
class TestKelas {
  // di sini, method test() tidak di-sinkronisasi
  public void test(String s) {		
    System.out.print("[" + s);
    try {
      Thread.sleep(1000);	
    } catch (InterruptedException e) {
      e.printStackTrace();
    }		
    System.out.println("]");
  }
}

class MyThread implements Runnable {	  
  private TestKelas obj;
  private Thread t;
  private String msg;
    
  MyThread(TestKelas obj, String msg) {
    t = new Thread(this);
    this.obj = obj;
    this.msg = msg;
    t.start();
  }
    
  public void run() {
    // membuat blok sinkronisasi
    synchronized(obj) {
      // di sini, method test() akan di-sinkronisasi
      obj.test(msg);	
    }   	    
  }    
}

class DemoBlokSinkronisasi {       
  public static void main(String[] args) 
    throws InterruptedException {     
    
    TestKelas tk = new TestKelas();
    
    MyThread t1 = new MyThread(tk, "Contoh");
    MyThread t2 = new MyThread(tk, "Sinkronisasi");
    MyThread t3 = new MyThread(tk, "Method");
  } 
}