/*
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 */

/**
 *
 * @author LH
 */
public class Lock{
  private boolean isLocked = false;
  
  public synchronized void lock()
  throws InterruptedException{
    while(isLocked){
      wait();
    }
    isLocked = true;
  }
  
  public synchronized void unlock(){
    isLocked = false;
    notify();
  }
}