Exemplo de deadlock

package DeadLock2;

//Un exemplo deadlock. class A {

 synchronized void foo(B b) {
   String name = Thread.currentThread().getName();

   System.out.println(name + " dentro A.foo");

   try {
     Thread.sleep(1000);
   } catch(Exception e) {
     System.out.println("A Interrupted");
   }

   System.out.println(name + " Intentando chamar a B.last()");
   b.last();
 }

 synchronized void last() {
   System.out.println("Dentro de A.last");
 }

}

class B {

 synchronized void bar(A a) {
   String name = Thread.currentThread().getName();
   System.out.println(name + " dentro B.bar");

   try {
     Thread.sleep(1000);
   } catch(Exception e) {
     System.out.println("B Interrupted");
   }

   System.out.println(name + " Intentando chamar a a A.last()");
   a.last();
 }

 synchronized void last() {
   System.out.println("Dentro de A.last");
 }

}

class Deadlock2 implements Runnable {

 A a = new A();
 B b = new B();

 Deadlock2() {
   Thread.currentThread().setName("MainThread");
   Thread t = new Thread(this, "RacingThread");
   t.start();

   a.foo(b); // get lock on a in this thread.
   System.out.println("Back in main thread");
 }

 public void run() {
   b.bar(a); // get lock on b in other thread.
   System.out.println("Back in other thread");
 }

 public static void main(String args[]) {
   new Deadlock2();
 }

}