package com.john.binarysearchtree;

public class UnderflowException extends Exception {
	private String message;

	public UnderflowException(String message) {
		super();
		this.message = message;
	}
}

@@ -170,16 +170,150 @@
 per();%0D%0A
+%09%09this.setMessage(message);%0D%0A%09%7D%0D%0A%0D%0A%09public String getMessage() %7B%0D%0A%09%09return message;%0D%0A%09%7D%0D%0A%0D%0A%09public void setMessage(String message) %7B%0D%0A
 %09%09this.m

添加getter/setter方法