Java多線程臟讀

package com.wkcto.intrinsiclock;

/**
 * 臟讀
 *  出現(xiàn)讀取屬性值出現(xiàn)了一些意外, 讀取的是中間值,而不是修改之后 的值
 *  出現(xiàn)臟讀的原因是 對共享數(shù)據(jù)的修改 與對共享數(shù)據(jù)的讀取不同步
 *  解決方法:
 *      不僅對修改數(shù)據(jù)的代碼塊進行同步,還要對讀取數(shù)據(jù)的代碼塊同步
 * Author: 老崔
 */
public class Test08 {
    public static void main(String[] args) throws InterruptedException {
        //開啟子線程設置用戶名和密碼
        PublicValue publicValue = new PublicValue();
        SubThread t1 = new SubThread(publicValue);
        t1.start();

        //為了確定設置成功
        Thread.sleep(100);
        //在main線程中讀取用戶名,密碼
        publicValue.getValue();
    }

    //定義線程,設置用戶名和密碼
    static class  SubThread extends  Thread{
        private PublicValue publicValue;
        public SubThread( PublicValue publicValue){
            this.publicValue = publicValue;
        }

        @Override
        public void run() {
            publicValue.setValue("bjpowernode", "123");
        }
    }

    static class PublicValue{
        private String name = "wkcto";
        private String pwd = "666";

        public synchronized void getValue(){
            System.out.println(Thread.currentThread().getName() + ", getter -- name: " + name + ",--pwd: " + pwd);
        }

        public synchronized void setValue(String name, String pwd){
            this.name = name;
            try {
                Thread.sleep(1000);             //模擬操作name屬性需要一定時間
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            this.pwd = pwd;
            System.out.println(Thread.currentThread().getName() + ", setter --name:" + name + ", --pwd: " + pwd );
        }
    }
}