Hello world输出2（函数输出）

import java.util.function.*;enum num{    Hello,world,}interface World{    public void print();}class Message extends Thread{    private String num;    public Message(String num){        this.num=num;    }    @Override    public void run(){        System.out.print(num);    }}public class Hello {    public static void main(String[] args) {        System.out.println(num.Hello+" "+num.world);        World w=()->System.out.println("hello world");        w.print();        Consumer<String> cons=System.out::println;        cons.accept("hello world");        Message msg=new Message("hello");        Message msg1=new Message("world");        msg.start();        msg1.start();    }}