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一个类对另一个类的依赖应该建立在最小的接口上
package com.atguigu.principle.segregation;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");}
}
//A 类通过接口Interface1 依赖(使用) B类，但是只会用到1,2,3方法
class A { public void depend1(Interface1 i) {i.operation1();}public void depend2(Interface1 i) {i.operation2();}public void depend3(Interface1 i) {i.operation3();}
}//C 类通过接口Interface1 依赖(使用) D类，但是只会用到1,4,5方法
class C { public void depend1(Interface1 i) {i.operation1();}public void depend4(Interface1 i) {i.operation4();}public void depend5(Interface1 i) {i.operation5();}
}改进后
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();}
}
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