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final class ControlledStop implements Runnable {
  private boolean done = false;
 
  public void run() {
    while (!done) {
      try {
        // ...
        Thread.currentThread().sleep(1000); // Do something
      } catch(InterruptedException ie) { 
        // handle exception
      } 
    } 	 
  }

  protected void shutdown(){
    done = true;
  }
}

class BankOperation {
  private int balance = 0;
  private boolean initialized = false;
 
  public BankOperation() {
    if (!performAccountVerification()) {
      throw new SecurityException("Invalid Account"); 
    }
    balance = 1000;   
    initialized = true; 
  }
  
  private int getBalance() {
    if (initialized == true) {
      return balance;
    }
    else {
      return -1;
    }
  }
}

class Holder {
  volatile ImmutablePoint ipoint;
  
  Holder(ImmutablePoint ip) {
    ipoint = ip;
  }
  
  void getPoint() {
    return ipoint();
  }

  void setPoint(ImmutablePoint ip) {
    this.ipoint = ip;
  }
}