Lambda表達式簡化過程

package com.lee.lambda;

//推導lambda表達式
public class TestLambda1 {

    //3.靜態內部類
    static class Like1 implements ILike{
        @Override
        public void sad() {
            System.out.println("Lambda1表達式學習！");
        }
    }

    public static void main(String[] args) {

        ILike like = new Like();
        like.sad();

        ILike like1 = new Like1();
        like1.sad();

        //4.局部內部類
        class Like2 implements ILike{
            @Override
            public void sad() {
                System.out.println("Lambda2表達式學習！");
            }
        }
        ILike like2 = new Like2();
        like2.sad();

        //5.匿名內部類，沒有類的名稱，必須借助接口或者父類。
        ILike like3 = new ILike() {
            @Override
            public void sad() {
                System.out.println("Lambda3表達式學習！");
            }
        };
        like3.sad();

        //6.lambda表達式
        ILike like4 = ()-> {
                System.out.println("Lambda4表達式學習！");
        };
        like4.sad();


    }

}

//1.定義一個函數式接口
interface ILike{
    void sad();
}

//2.實現類
class Like implements ILike{
    @Override
    public void sad() {
        System.out.println("Lambda表達式學習！");
    }
}