1 public class ObjectMonitor extends Object {
   2    private int locked;
   3    
   4    public ObjectMonitor() {
   5       this(1);
   6    }
   7    
   8    public ObjectMonitor(int lock) {
   9       locked = lock;
  10    }
  11    
  12    public synchronized void lock(boolean lock) {
  13       if (lock) {
  14          while (locked == 0) {
  15             try {
  16                wait();
  17             } catch (InterruptedException e) {
  18             }
  19          }
  20          locked--;
  21       } else {
  22          locked++;
  23          notify();
  24       }       
  25    }
  26 }
  27