java lambda表达式

Lambda表达式

• 函数式接口：只包含唯一一个抽象方法的接口
• 可以用lambda表达式创建该接口的对象

public class MyLambda {


    //3.静态内部类
    static class Like2 implements ILike{
        @Override
        public void lambda() {
            System.out.println("I like lambda2");
        }
    }


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

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

        //4.局部内部类
        class Like3 implements ILike{
            @Override
            public void lambda() {
                System.out.println("I like lambda3");
            }
        }

        like = new Like3();
        like.lambda();

        //5.匿名内部类，没有类的名称，必须借助接口或者父类
        like = new ILike() {
            @Override
            public void lambda() {
                System.out.println("I like lambda4");
            }
        };
        like.lambda();

        //6.lambda
        like = () -> {
            System.out.println("I like lambda5");
        };
        like.lambda();

        //7.简化lambda 只有一行代码才行，否则就用代码块
        //若括号内有参数类型，则可以都去掉
        //(int a, int b)  (a,b)
        like = () -> System.out.println("I like lambda6");
        like.lambda();

    }
}

//1.函数式接口
interface ILike{
    void lambda();
}

//2.实现类
class Like implements ILike{
    @Override
    public void lambda() {
        System.out.println("I like lambda1");
    }
}