package com.higgin.part4;/** * 在我们对一个对象的方法加锁的时候，需要考虑业务的整体性。 * 本例子中的setValue或getValue必须同时加上synchronized同步关键字，办证业务的原子性，不然会出现业务错误  */public class DirtyRead {    private String username="zhangsan";    private String password="123";        public synchronized void setValue(String username,String password){        this.username=username;        try {            Thread.sleep(2000);   //延时2秒        } catch (InterruptedException e) {            e.printStackTrace();        }        this.password=password;        System.out.println("setValue最终结果【 username = "+username+", password = "+password + "】");    }        /**     * 加和不加synchronized有区别     */    public void getValue(){        System.out.println("getValue最终结果【 username = "+username+", password = "+password + "】");    }        public static void main(String[] args) throws InterruptedException {        final DirtyRead dr = new DirtyRead();                Thread t1 = new Thread(new Runnable() {            @Override            public void run() {                dr.setValue("lisi", "456");            }        });        t1.start();   //t1线程去设置值        Thread.sleep(1000);        dr.getValue();    //相当于main线程去读取值    }}