From 0f2ee44ad72649a13ed5913dce71532bb024489a Mon Sep 17 00:00:00 2001
From: dunera <458098102@qq.com>
Date: Mon, 9 Apr 2018 00:19:15 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC9=E9=A2=98-=E5=A2=9E=E5=8A=A0=E5=87=BA?=
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---
 notes/剑指 offer 题解.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/notes/剑指 offer 题解.md b/notes/剑指 offer 题解.md
index 2dc15d12..6d27553b 100644
--- a/notes/剑指 offer 题解.md	
+++ b/notes/剑指 offer 题解.md	
@@ -393,11 +393,14 @@ public void push(int node) {
     in.push(node);
 }
 
-public int pop() {
+public int pop() throws Exception{
     if (out.isEmpty()) {
         while (!in.isEmpty()) {
             out.push(in.pop());
         }
+        if (out.isEmpty()){
+            throw new Exception("queue is empty");
+        }
     }
     return out.pop();
 }