public class Lock{
  protected MonitorObject monitorObject = new MonitorObject();
  protected boolean isLocked = false;

  public void lock() throws InterruptedException{
    synchronized(this){
      while(isLocked){
        synchronized(this.monitorObject){
            this.monitorObject.wait();
        }
      }
      isLocked = true;
    }
  }

  public void unlock(){
    synchronized(this){
      this.isLocked = false;
      synchronized(this.monitorObject){
        this.monitorObject.notify();
      }
    }
  }
}