1. 枚举类

 

跳了很多。。。

 2. 注解

3. 作业

1. 注意：所有类共享静态属性

所以结果是 9，red     100，red

package com.zsq.homework1;

public class HM1 {
    public static void main(String[] args) {
        Cellphone cellphone = new Cellphone();
        cellphone.testWork(new Calculate() {
            @Override
            public double work(double n1, double n2) {
                return n1+n2;
            }
        },100, 200);


    }
}

interface Calculate{
    public double work(double n1, double n2);
}

class Cellphone{
    public void testWork(Calculate calculate, double n1, double n2){
        double result = calculate.work(n1, n2);
        System.out.println("结果是" + result);
    }
}