多线程

Posted 2020-10-14 薄荷*糖糖

多线程习题

题目：

编写一个创建三个线程对象的程序。每个线程应该输出一则消息，并且消息后紧跟字符串“消息结束”。

在线程输出消息后，应暂停一秒钟，然后才输出“消息结束”，首先应该由线程1输出消息，然后是线程2和线程3。

 

package multithread;

public class ThreadTest {

	public static void main(String[] args) {

		showMsg s = new showMsg();

		callMsg c1 = new callMsg(s, "消息1");
		callMsg c2 = new callMsg(s, "消息2");
		callMsg c3 = new callMsg(s, "消息3");

		c1.start();
		c2.start();
		c3.start();

	}
}
	class showMsg {
		public void call(String msg) {
			System.out.println(msg);
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				
				e.printStackTrace();
			}
			System.out.println("消息结束");
		}
	}

	class callMsg extends Thread {
		showMsg showmsg;
		String msg;

		public callMsg(showMsg showmsg, String msg) {
			this.showmsg = showmsg;
			this.msg = msg;
		}

		@Override
		public void run() {
			synchronized (showmsg) {
				showmsg.call(msg);
			}
		}
	}