3 线程按顺序打印数字

本文介绍了3 线程按顺序打印数字的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试编写一个简单的代码来按顺序打印数字.场景就像

I am trying to write a simple code to print numbers in sequence. Scenario is like

Thread Number T1 1 T2 2 T3 3 T1 4 T2 5 T3 6 T1 7 T2 8 T3 9 ...and so on.

这里是

public class ThreadNumberPrinter { Object monitor = new Object(); AtomicInteger number = new AtomicInteger(1); public static void main(String[] args) { ThreadNumberPrinter tnp = new ThreadNumberPrinter(); Thread t1 = new Thread(tnp.new Printer(1, 3)); Thread t2 = new Thread(tnp.new Printer(2, 3)); Thread t3 = new Thread(tnp.new Printer(3, 3)); t3.start(); t1.start(); t2.start(); } class Printer implements Runnable { int threadId; int numOfThreads; public Printer(int id, int nubOfThreads) { threadId = id; this.numOfThreads = nubOfThreads; } public void run() { print(); } private void print() { try { while (true) { Thread.sleep(1000l); synchronized (monitor) { if (number.get() % numOfThreads != threadId) { monitor.wait(); } else { System.out.println("ThreadId [" + threadId + "] printing -->" + number.getAndIncrement()); monitor.notifyAll(); } } } } catch (InterruptedException e) { e.printStackTrace(); } } } }

但是在第二个线程运行并打印数字 2 之后，所有线程都进入等待阶段并且没有打印任何内容.我不确定我哪里做错了.任何帮助将不胜感激.

But just after 2nd thread runs and prints the number 2, all thread get into wait stage and nothing gets printed. I am not sure where I am doing wrong. Any help would be greatly appreciated.

推荐答案

嗯，问题是模 3 % 3 是 0.将您的 threadIds 更改为 0..2 而不是 1..3 并希望它应该可以工作.

Well, the problem is that modulo 3 % 3 is 0. Change your threadIds to 0..2 instead of 1..3 and hopefully it should work.