2.3.2解决同步死循环

测试如下

package com.cky.test;

/**
 * Created by edison on 2017/12/9.
 */
public class PrintString implements  Runnable{
    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();
            }
        }
    }

    @Override
    public void run() {
        printStringMethod();
    }
}

package com.cky.test;

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

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

    }
}

我要停止他 stopmain
run printThread-0

但当上面的例子代码的格式运行在-server服务器的模式中64bit的JVM上时，会出现死循环

解决的方案时使用volatile关键字

关键字volatile的作用是强制从公共堆栈中取得变量的值，而不是从线程私有数据栈中取得变量的值