Lamda運算式使用

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 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             @Override14             public void print(String something){15                 System.out.println(something);16             }17         };18         //use lammbda expression
　　　　　　　//lambda運算式的使用形式是（arg1，arg2,...）->{  代碼塊}
　　　　　　　　//和上面利用建構函式構造介面實現對象的作用是一樣的。但是看起來更加簡潔。
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
　　*這裡申明一個函數式介面：只有一個函數的介面
　　*Lambda 運算式引入的目標是：Lambda運算式原被定義為一個函數式介面的內聯實現。
41  */42 interface Printer{43     public void print(String something);44     45 }

　　lambda能夠寫出更加緊湊的代碼，便於閱讀和跟蹤。在效能和多核處理方法上也具有不少好處，詳細需要瞭解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);}

Lamda運算式使用