Lamda表达式使用

Posted 2020-08-24 努力追上曾经的自己

 1 public class Lambda {
 2 
 3     public static void main(String[] args) {
 4 
 5         Lambda lambda=new Lambda();
 6         String something="oop print somthing";
 7         String something1="oop print something2";
 8         String something2="lambda print something";
 9 
10         lambda.printSomething(something);
11         
12         Printer printer=new Printer(){
13             @Override
14             public void print(String something){
15                 System.out.println(something);
16             }
17         };
18         //use lammbda expression
　　　　　　　//lambda表达式的使用形式是（arg1，arg2,...）->{  代码块}
　　　　　　　　//和上面利用构造函数构造接口实现对象的作用是一样的。但是看起来更加简洁。

19         Printer printer1= something3->System.out.println(something3);
20 
21         
22         lambda.printSomething(something1, printer);
23         lambda.printSomething(something2, printer1);
24         
25     }
26     /*
27      * 
28      */
29     public void printSomething(String something){
30         System.out.println(something);
31         
32     }
33     public void printSomething(String something,Printer printer) {
34         printer.print(something);
35         
36     }
37 }
38 
39 /*
40  * function interface
　　*这里申明一个函数式接口：只有一个函数的接口
　　*Lambda 表达式引入的目标是：Lambda表达式原被定义为一个函数式接口的内联实现。

41  */
42 interface Printer{
43     public void print(String something);
44     
45 }

　　lambda能够写出更加紧凑的代码，便于阅读和跟踪。在性能和多核处理方法上也具有不少好处，详细需要了解stream API.

public class Lambda {
public static void main(String[] args) {
Lambda lambda=new Lambda();String something="oop print somthing";String something1="oop print something2";String something2="lambda print something";
lambda.printSomething(something);Printer printer=new Printer(){@Overridepublic void print(String something){System.out.println(something);}};//use lammbda expressionPrinter printer1= something3->System.out.println(something3);
lambda.printSomething(something1, printer);lambda.printSomething(something2, printer1);}/* *  */public void printSomething(String something){System.out.println(something);}public void printSomething(String something,Printer printer) {printer.print(something);}}
/* * function interface */interface Printer{public void print(String something);}