TogliStallo.java

public class TogliStallo {

public static Object Lock1 = new Object();
   public static Object Lock2 = new Object();
   private static int finito1,finito2;

   public static void main(String args[]) {
      finito1=0;
      Thread1 T1 = new Thread1();
      Thread2 T2 = new Thread2();
      T1.start();
      T2.start();
      while (finito1!=2 && finito2!=2) try { Thread.sleep(10); }
            catch (InterruptedException e) {};
      System.out.println("Fatto!");
   }

   private static class Thread1 extends Thread {
      @Override
      public void run() {
         synchronized (Lock1) {
            System.out.println("Thread 1: In possesso del lock 1...");
            try { Thread.sleep(10); }
            catch (InterruptedException e) {}
            System.out.println("Thread 1: In attesa del lock 2...");
            synchronized (Lock2) {
               System.out.println("Thread 1: In possesso del lock 1 e 2...");
               finito1++;finito2++;
            }
         }
      }
   }

   private static class Thread2 extends Thread {
      @Override
      public void run() {
         synchronized (Lock2) {
            System.out.println("Thread 2: In possesso del lock  2...");
            try { Thread.sleep(10); }
            catch (InterruptedException e) {}
            System.out.println("Thread 2:  In attesa del lock 1...");
            synchronized (Lock1) {
               System.out.println("Thread 2: In possesso del lock 1 e 2...");
               finito1++;finito2++;
            }
         }
      }
   }