Lambda表达式的原理和使用

public class TestLambda1 {

    //3.静态内部类
    static class Like2 implements ILike{
        public void lambda() {
            System.out.println("I like lambda静态内部类!");
        }
    }

    public static void main(String[] args) {
        ILike iLike = new Like();
        iLike.lambda();

        iLike = new Like2();
        iLike.lambda();

        //4.局部内部类
        class Like3 implements ILike{
            public void lambda() {
                System.out.println("I like lambda局部内部类!");
            }
        }
        iLike = new Like3();
        iLike.lambda();

        //5.匿名内部类，没有类的名称，必须借助接口和父类
        iLike = new ILike(){
            public void lambda() {
                System.out.println("I like lambda匿名内部类!");
            }
        };
        iLike.lambda();

        //6.用lamda表达式简化，jdk1.8，()里面写参数
        iLike = ()->{
            System.out.println("I like lambda表达式!");
        };
        iLike.lambda();

    }
}

//1.定义一个函数式接口，只有一个方法的接口
interface ILike{
    void lambda();
}

//2.实现类
class Like implements ILike{
    public void lambda() {
        System.out.println("I like lambda实现类!");
    }
}