竞争抢答器

/*实现一个竞拍抢答程序：要求设置三个抢答者（三个线程），而后同时发出抢答指令，抢答成功者显示成功提示，抢答失败者给出失败提示。*/
package java多线程_01;
import java.util.concurrent.callable;
import java.util.concurrent.futuretask;
class mythread_08 implements callable<string>{
	private boolean flag = false;
	@override
	public string call() throws exception{
		synchronized(this) {
			if(this.flag == false) {
				this.flag = true;
				return thread.currentthread().getname()+"抢答成功!";
			}else {
				return thread.currentthread().getname()+"抢答失败!";
			}
		}
		
	}
}
public class homework_03 {
	public static void main(string[] args) throws exception{
		mythread_08 mt = new mythread_08();
		futuretask<string> taska = new futuretask<string>(mt);
		futuretask<string> taskb = new futuretask<string>(mt);
		futuretask<string> taskc = new futuretask<string>(mt);
		new thread(taska, "竞赛者a").start();
		new thread(taskb, "竞赛者b").start();
		new thread(taskc, "竞赛者c").start();
		system.out.println(taska.get());
		system.out.println(taskb.get());
		system.out.println(taskc.get());
	}
}