Lambda表达式是Java8的新特性，是Java吸收了其他语言的优势创新出来的一种表达方法。

基本结构（参数）->｛函数体｝

下面举个栗子：

随便输出一堆字符串

这是原来的常规输入方式

package com.plat.acoal.test.java8;

public class LambdaDemo {
    interface Printer {
        void printer(String val);
    }

    public void printSomething(String something, Printer printer) {
        printer.printer(something);
    }

    public static void main(String[] args) {
        LambdaDemo lambdaDemo = new LambdaDemo();
        String things = "erw34523";
        Printer printer = new Printer() {
            @Override
            public void printer(String val) {
                System.out.println(val);
            }
    };

        lambdaDemo1.printSomething(things ,printer);
}}

下面采用表达式通用方式

package com.plat.acoal.test.java8;

public class LambdaDemo{
    interface Printer {
        void printer(String val);
    }

    public void printSomething(String something, Printer printer) {
        printer.printer(something);
    }

    public static void main(String[] args) {
        LambdaDemo1 lambdaDemo = new LambdaDemo();
        String some = "erw34523";
        Printer printer = new Printer() {
            @Override
            public void printer(val) {
                System.out.println(val);
            }
    };

        lambdaDemo1.printSomething(some,printer);
}}

如果参数只有一个，且代码只有一行

package com.plat.acoal.test.java8;

public class LambdaDemo1 {
    interface Printer {
        void printer(String val);
    }

    public void printSomething(String something, Printer printer) {
        printer.printer(something);
    }

    public static void main(String[] args) {
      
      lambdaDemo1.printSomething(some,val->System.out.println(val));

}}

如此精炼，真是美滋滋

PS：参考了字母哥的文章和B站视频，真是宝藏男孩！