1.依赖倒置原则
A.高层次的模块不应该依赖于低层次的模块，他们都应该依赖于抽象。
B.抽象不应该依赖于具体，具体应该依赖于抽象。
2.用UML图来说明一下：
代码说明：
（1）管理员接口
1 package com.alibaba.com.miao;
2
3 public interface IEmployee {
4
5 public String code(ICode code);
6 }
（2）编码接口
1 package com.alibaba.com.miao;
2
3 public interface ICode {
4
5 public String getRun(String Run);
6 }
（3）编码类
1 package com.alibaba.com.miao;
2
3 public class Code implements IEmployee {
4
5 private static final String Run = "编码活动";
6
7 @Override
8 public String code(ICode code) {
9
10 System.out.println(code + "程序员开始编码...");
11
12 return code.getRun(Run);
13 }
14 }
（4）普通程序员
1 package com.alibaba.com.miao;
2
3 public class CommonProgrammer implements ICode {
4
5 private static final String Run = "JACK";
6
7 @Override
8 public String getRun(String Run1) {
9 String Run2 = "工作";
10 System.out.println(Run + " 普通程序员开始工作");
11 return Run2;
12 }
13
14 }
（5）高级程序员
1 package com.alibaba.com.miao;
2
3 public class SeniorProgrammer implements ICode {
4
5 private static final String Run = "李四";
6
7 @Override
8 public String getRun(String Run1) {
9 String Run2 = "工作";
10 return Run2;
11 }
12
13 }
（6）测试类
1 <%@page import="com.alibaba.com.miao.ICode"%>
2 <%@page import="com.alibaba.com.miao.CommonProgrammer"%>
3 <%@page import="com.alibaba.com.miao.SeniorProgrammer"%>
4 <%@page import="com.alibaba.com.miao.Code"%>
5 <%@page import="com.alibaba.com.miao.IEmployee"%>
6 <%@ page language="java" contentType="text/html; charset=UTF-8"
7 pageEncoding="UTF-8"%>
8 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
9 <html>
10 <head>
11 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
12 <title>单一职责原则</title>
13 </head>
14 <body>
15
16 <%
17 IEmployee employee = new Code();
18
19 ICode code = new SeniorProgrammer();
20 ICode code1 = new CommonProgrammer();
21
22 out.println(" " + employee.code(code));
23 out.println("管理人员派张三高级程序员" + employee.code(code1));
24 %>
25
26 </body>
27 </html>
（7）参考目录结构
参考：Java Web设计模式之道。
Java Web设计模式之依赖倒换原则
时间： 2024-12-14 21:46:49