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

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

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");
    }
}