Java设计模式七大原则之里氏替换原则详解

/**
 * 计算器类
 * @author:liyajie
 * @createTime:2022/1/31 15:25
 * @version:1.0
 */
public class Calculator {
    //定义加法功能
    public int add(int a,int b){
        return a + b;
    }
    //定义减法功能
    public int sub(int a,int b){
        return a - b;
    }
}

/**
 * 超级计算器类
 * @author:liyajie
 * @createTime:2022/1/31 15:25
 * @version:1.0
 */
public class SuperCalculator extends Calculator{
    //增补需求，两数相加再加5
    @Override
    public int add(int a,int b){
        return a + b + 5;
    }
    //希望两数相加之和与100求差
    public int mul(int a,int b){
        int count = add(a, b);
        return 100 - count;
    }
}

/**
 * 测试类1
 * @author:liyajie
 * @createTime:2022/1/31 15:25
 * @version:1.0
 */
public class Test1 {

    public static void main(String[] args) {
        int result = new Calculator().add(4,6);
        System.out.println("4和6之和为:" + result);

        int mul = new SuperCalculator().mul(4,6);
        System.out.println("4和6之和与100相差:" + mul);
    }
}

/**
 * 基础类
 * @author:liyajie
 * @createTime:2022/1/31 15:36
 * @version:1.0
 */
public class Base {
    
}

/**
 * 超级计算器类
 * @author:liyajie
 * @createTime:2022/1/31 15:25
 * @version:1.0
 */
public class SuperCalculatorNew extends Base{

    private Calculator calculator = new Calculator();

    //增补需求，两数相加再加5
    public int add(int a,int b){
        return a + b + 5;
    }
    //希望两数相加之和与100求差
    public int mul(int a,int b){
        int count = calculator.add(a, b);
        return (100 - count);
    }
}

/**
 * 测试类2
 * @author:liyajie
 * @createTime:2022/1/31 15:25
 * @version:1.0
 */
public class Test2 {

    public static void main(String[] args) {
        int result = new Calculator().add(4,6);
        System.out.println("4和6之和为:" + result);

        int mul = new SuperCalculatorNew().mul(4,6);
        System.out.println("4和6之和与100相差:" + mul);
    }
}