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class PackBoxCountBoxes implements Runnable {
  static volatile int lengthcounter;
  // ...

  Object lock = new Object();    

  public void run() {
    synchronized(lock) {
      lengthcounter++; // Dimensions after packing the box	 
      // ... 
    } 
  }

  public static void main(String[] args) {
    Runnable r1 = new Box();
    Thread t1 = new Thread(r1);
    Runnable r2 = new Box();
    Thread t2 = new Thread(r2);
    t1.start();
    t2.start();
  }
}

class PackBoxCountBoxes implements Runnable {
  static volatile int lengthcounter;
  // ...

  static Object lock = new Object();    
  // ...
}