Lambda简介

public class Program {
    public static void main(String[] args) {
        //使用接口实现类
        MyCompare myCompare = new MyCompare();

        //使用匿名内部类
        Compare compare = new Compare(){
            @Override
            public int compare(int a, int b) {
                return a+b;
            }
        };

        //使用Lambda表达式来实现接口
        Compare compare1 = (a,b) -> a -b;
    }
}


class MyCompare implements Compare{

    @Override
    public int compare(int a, int b) {
        return a+b;
    }
}


@FunctionalInterface    //该接口只可以有1种实现方式
interface Compare{
    int compare(int a, int b);
}