JAVA学习之路_homework_day10

1.a. 定义一个接口Compute，用来完成计算器的功能，比如最简单的加减乘除功能
interface Compute {double compute(double a, double b) }
b. 定义一个ShowCompute类，里面定义一个工具方法calculate(Compute com,double a, double b)
该方法可以执行，两个double类型数据的加减乘除（也就是需要定义不同的Compute接口的子类，实现具体的加减乘除功能，当执行该方法时，传递不同的子类对象，就可以完成不同的计算）
编写一个测试类，
通过调用ShowCompute类的compute(Compute com,double a, double b)方法来完成加减乘除功能

package com.homework.homework0723;
/**
 * @Author kinmon
 * @Date 2020/7/23 19:35
 * @Version 1.0
 */
public class Problem1 {
    public static void main(String[] args) {
        double a = 10.0;
        double b = 20.0;
        double result = 0.0;
        result = ShowCompute.calculate(new Compute() {
            @Override
            public double compute(double a, double b) {
                return a + b;
            }
        },a,b);
        System.out.println(result);
        result = ShowCompute.calculate(new Compute() {
            @Override
            public double compute(double a, double b) {
                return a - b;
            }
        },a,b);
        System.out.println(result);
        result = ShowCompute.calculate(new Compute() {
            @Override
            public double compute(double a, double b) {
                return a * b;
            }
        },a,b);
        System.out.println(result);
        result = ShowCompute.calculate(new Compute() {
            @Override
            public double compute(double a, double b) {
                return a / b;
            }
        },a,b);
        System.out.println(result);
    }
}
interface Compute {double compute(double a, double b);}
class ShowCompute {
    public static double calculate(Compute com,double a, double b) {
        return com.compute(a,b);
    }
}

2. 根据注释填写(1), (2),(3)处的代码
   public class Test{
   public static void main(String[] args){
   // 初始化bean1
   (1)
   bean1.i++;
   // 初始化bean2
   (2)
   bean2.j++;
   //初始化bean3
   (3)
   bean3.k++;
   }
   class Bean1{
   public int i = 0;
   }

   static class Bean2{
   public int j = 0;
   }
   }

class Bean{
class Bean3{
public int k = 0;
}
}