invalidpositionexception.java

真的很麻烦也

// A run-time exception for invalid positions
public class InvalidPositionException extends RuntimeException {  
  public InvalidPositionException(String err) {
    super(err);
  }
}
class EmptyContainerException extends RuntimeException {  
  public EmptyContainerException(String err) {
    super(err);
  }
}

class BoundaryViolationException extends RuntimeException {  
  public BoundaryViolationException(String err) {
    super(err);
  }
}

class InvalidKeyException  extends RuntimeException {  
  public InvalidKeyException(String err) {
    super(err);
  }
}