设计模式原则之：单一职责模式

  对类来说的，即一个类应该只负责一项职责。如类A负责两个不同的职责，职责1，职责2。当职责1需求变更而改变A时，可能造成职责2智行错误，所以要将类A的粒度分解为A1，A2

错误的应用实例

+ View Code?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

package org.example.demo0;   /**  * @description: 单一职责原则  * @author: abel.he  * @date: 2023-07-31  **/ public class SingleResponsibility {       public static void main(String[] args) {         Vehicle vehicle = new Vehicle();         vehicle.run("摩托车");         vehicle.run("汽车");         vehicle.run("飞机");       } } class Vehicle {     public void run(String vehicleName) {         System.out.println(vehicleName + "在公路上运行");     } }

正确的实例

+ View Code?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

package org.example.demo0;   /**  * @description: 单一职责原则(正确)  * @author: abel.he  * @date: 2023-07-31  **/ public class SingleResponsibilityCorrect {       public static void main(String[] args) {         Vehicle1 vehicle1 = new Vehicle1();         vehicle1.run("小汽车");           Air air = new Air();         air.run("飞机");               }   }   /**  * 汽车工具类  */ class Vehicle1 {     public void run(String vehicleName) {         System.out.println(vehicleName + "在地上跑");     } }   class Air {     public void run(String airName) {         System.out.println(airName + "在天上飞");     } }