设计线程类WorkThead,其构造函数接收一个message字符串作为参数,把该字符串打印到console上,同时,在WorkThread的main函数中启动该线程
public WorkThread implements Runnable{private String message;public WorkThred(String message){this.message=message;}public void run(){synchronized(this){System.out.println(message);}}public static void main(String args[]){Thread t=new Thread(newWorkThread("Hello World!"));t.start();}}