diff --git a/notes/设计模式.md b/notes/设计模式.md
index 4f561df4..536072c2 100644
--- a/notes/设计模式.md
+++ b/notes/设计模式.md
@@ -639,22 +639,27 @@ abc
 
 ```java
 public abstract class Handler {
+
     protected Handler successor;
 
+
     public Handler(Handler successor) {
         this.successor = successor;
     }
 
+
     protected abstract void handleRequest(Request request);
 }
 ```
 
 ```java
 public class ConcreteHandler1 extends Handler {
+
     public ConcreteHandler1(Handler successor) {
         super(successor);
     }
 
+
     @Override
     protected void handleRequest(Request request) {
         if (request.getType() == RequestType.TYPE1) {
@@ -669,11 +674,13 @@ public class ConcreteHandler1 extends Handler {
 ```
 
 ```java
-public class ConcreteHandler2 extends Handler{
+public class ConcreteHandler2 extends Handler {
+
     public ConcreteHandler2(Handler successor) {
         super(successor);
     }
 
+
     @Override
     protected void handleRequest(Request request) {
         if (request.getType() == RequestType.TYPE2) {
@@ -689,22 +696,27 @@ public class ConcreteHandler2 extends Handler{
 
 ```java
 public class Request {
+
     private RequestType type;
     private String name;
 
+
     public Request(RequestType type, String name) {
         this.type = type;
         this.name = name;
     }
 
+
     public RequestType getType() {
         return type;
     }
 
+
     public String getName() {
         return name;
     }
 }
+
 ```
 
 ```java
@@ -715,11 +727,15 @@ public enum RequestType {
 
 ```java
 public class Client {
+
     public static void main(String[] args) {
+
         Handler handler1 = new ConcreteHandler1(null);
         Handler handler2 = new ConcreteHandler2(handler1);
+
         Request request1 = new Request(RequestType.TYPE1, "request1");
         handler2.handleRequest(request1);
+
         Request request2 = new Request(RequestType.TYPE2, "request2");
         handler2.handleRequest(request2);
     }