y987425112 commented on issue #145: Adding volatile keywords to member variables URL: https://github.com/apache/tomcat/pull/145#issuecomment-470503719 package com.ydy.thread.volatile2; public class VolatileTest2 { public static void main(String[] args) { Task task = new Task(); Thread t1 = new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub while (true) { task.add(); } } }); Thread t2 = new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub while (true) { task.print(); } } }); t1.start(); t2.start(); } } class Task { private int i = 0; private int j = 0; private Object lock = new Object(); /** * add */ public synchronized void add() { i++; j++; } public void print() { synchronized (lock) { if (j > i) { // If no instruction reordering occurs, this line of code will never run System.out.println("Wrong result"); } } } } If no instruction reordering occurs, this line of code will never run `System.out.println("Wrong result");`
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