2.3.1关键字volatile与死循环

关键字volatile的主要作用是使变量在多个线程间可见。

测试如下

package com.cky.test;

/**
 * Created by edison on 2017/12/9.
 */
public class PrintString {
    private boolean isContinuePrint = true;

    public boolean getContinuePrint() {
        return isContinuePrint;
    }
    public void setContinuePrint (boolean isContinuePrint) {
        this.isContinuePrint = isContinuePrint;
    }

    public void printStringMethod() {
        while(isContinuePrint) {
            try {
                System.out.println("run print"+Thread.currentThread().getName());
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

}

package com.cky.test;

/**
 * Created by edison on 2017/12/9.
 */
public class Run {
    public static void main(String[] args) {

        PrintString printString = new PrintString();
        printString.printStringMethod();
        System.out.println("我要停止他 stop"+ Thread.currentThread().getName());
        printString.setContinuePrint(false);

    }
}

run printmain
run printmain
run printmain
run printmain

程序开始运行后

根本没停下来。原因是main线程一直处理while()循环，导致程序不能执行下面的代码。解决办法肯定是用多线程技术