java基础（多线程---lambda）

• λ希腊字母表中排序第十一位的字Lambda，

• 避免匿名内部类定义过多

• 其实质属于函数式编程的概念

 

(params) -> expression

(params) -> statement

(params) -> { statements}

 

例：

package com.sxt.thread;
/**
 * lambda推导 +参数+返回值
 * @author：裴新
 *
 */
public class LambdaTest03 {
    
    public static void main(String[] args) {
        IInterest interest = (int a,int c)-> {
            System.out.println("i like lambda -->"+(a+c));
            return a+c;
        };
        interest.lambda(100,200);
        
        interest = (a,c)-> {
            System.out.println("i like lambda -->"+(a+c));
            return a+c;
        };
        
        interest.lambda(200,200);
        
        interest = (a,c)-> {
            return a+c;
        };
        
        interest = (a,c)-> a+c;
        
        interest = (a,c)-> 100;
        
        System.out.println(interest.lambda(10, 20));
    }
}
interface IInterest{
    int lambda(int a,int b);
}
//外部类
class Interest implements IInterest{

    @Override
    public int lambda(int a,int c) {
        System.out.println("i like lambda -->"+(a+c));
        return a+c;
    }
    
}

package com.sxt.thread;
/**
 * Lambda表达式 简化线程(用一次)的使用
 * @author 裴新
 *
 */
public class LambdaThread {
    //静态内部类
    static class Test implements Runnable{        
        public void run() {
            for(int i=0;i<20;i++) {
                System.out.println("一边听歌");
            }
        }
    }
    public static void main(String[] args) {            
        //new Thread(new Test()).start();        
        
        //局部内部类
        class Test2 implements Runnable{        
            public void run() {
                for(int i=0;i<20;i++) {
                    System.out.println("一边听歌");
                }
            }
        }        
        new Thread(new Test2()).start();
        
        //匿名内部类 必须借助接口或者父类
        new Thread(new Runnable() {
            public void run() {
                for(int i=0;i<20;i++) {
                    System.out.println("一边听歌");
                }
            }
        }).start();
        
        //jdk8 简化  lambda表达式
        new Thread(()-> {
                for(int i=0;i<20;i++) {
                    System.out.println("一边听歌");
                }
            }
        ).start();
        
    }

}