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);}