不遵守接口隔离的案例
代码:
public class Segregation1 { public static void main(String[] args) { // TODO Auto-generated method stub } } //接口 interface Interface1 { void operation1(); void operation2(); void operation3(); void operation4(); void operation5(); } class B implements Interface1 { public void operation1() { System.out.println("B 实现了 operation1"); } public void operation2() { System.out.println("B 实现了 operation2"); } public void operation3() { System.out.println("B 实现了 operation3"); } public void operation4() { System.out.println("B 实现了 operation4"); } public void operation5() { System.out.println("B 实现了 operation5"); } } class D implements Interface1 { public void operation1() { System.out.println("D 实现了 operation1"); } public void operation2() { System.out.println("D 实现了 operation2"); } public void operation3() { System.out.println("D 实现了 operation3"); } public void operation4() { System.out.println("D 实现了 operation4"); } public void operation5() { System.out.println("D 实现了 operation5"); } } class A { //A 类通过接口Interface1 依赖(使用) B类,但是只会用到1,2,3方法 public void depend1(Interface1 i) { i.operation1(); } public void depend2(Interface1 i) { i.operation2(); } public void depend3(Interface1 i) { i.operation3(); } } class C { //C 类通过接口Interface1 依赖(使用) D类,但是只会用到1,4,5方法 public void depend1(Interface1 i) { i.operation1(); } public void depend4(Interface1 i) { i.operation4(); } public void depend5(Interface1 i) { i.operation5(); } }
问题
如果没有隔离接口,所有的接口在一个类中,可以看到B和D必须实现所有的接口
整改
优化思路
优化类图
代码
package com.atguigu.principle.segregation.improve; public class Segregation1 { public static void main(String[] args) { // TODO Auto-generated method stub // 使用一把 A a = new A(); a.depend1(new B()); // A类通过接口去依赖B类 a.depend2(new B()); a.depend3(new B()); C c = new C(); c.depend1(new D()); // C类通过接口去依赖(使用)D类 c.depend4(new D()); c.depend5(new D()); } } // 接口1 interface Interface1 { void operation1(); } // 接口2 interface Interface2 { void operation2(); void operation3(); } // 接口3 interface Interface3 { void operation4(); void operation5(); } class B implements Interface1, Interface2 { public void operation1() { System.out.println("B 实现了 operation1"); } public void operation2() { System.out.println("B 实现了 operation2"); } public void operation3() { System.out.println("B 实现了 operation3"); } } class D implements Interface1, Interface3 { public void operation1() { System.out.println("D 实现了 operation1"); } public void operation4() { System.out.println("D 实现了 operation4"); } public void operation5() { System.out.println("D 实现了 operation5"); } } class A { // A 类通过接口Interface1,Interface2 依赖(使用) B类,但是只会用到1,2,3方法 public void depend1(Interface1 i) { i.operation1(); } public void depend2(Interface2 i) { i.operation2(); } public void depend3(Interface2 i) { i.operation3(); } } class C { // C 类通过接口Interface1,Interface3 依赖(使用) D类,但是只会用到1,4,5方法 public void depend1(Interface1 i) { i.operation1(); } public void depend4(Interface3 i) { i.operation4(); } public void depend5(Interface3 i) { i.operation5(); } }
可以看到B和D不必实现所有的接口了,A和D也只获得了自己想要的接口而已.
完