Java8 lambda

gistfile1.java

//之前使用匿名类
new Thread(new Runnable() {  
    @Override  
    public void run() {  
        System.out.println("Hello world !");  
    }  
}).start();  

//现在使用lambda，无参数
new Thread(() -> System.out.println("Hello world !")).start(); 

//函数接口
@FunctionalInterface
public interface MyFn {
    void method(String arg);
}
 
//使用函数接口
MyFn fn = arg -> System.out.println(arg);
fn.method("hello world");

//给个场景
Arrays.asList(1,2,3,4).forEach(e -> System.out.println(e % 2 == 0 ? "even" : "odd"));