Java并发编程---业务数据的脏读问题

package com.thread.objectLock;

/**
* 业务数据的脏读问题(对象锁的同步与异步知识延伸)
* 要求取出的数据要有一致性,即读前和读后
* 避免脏读,要保证加锁的一致性,或加读写分离锁
* @author lhy
* @time 2017.12.22
*
*/
public class DirtyRead {

private String username = "haige";
private String password = "123";
public synchronized void setValue(String username, String password){
this.username = username;

try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

this.password = password;
System.out.println("setValue最终结果: username = " + username + ", password = " + password);
}

//初始时皆有synchronized,为了反映脏读问题,去掉该方法的synchronized
public synchronized void getValue(){
System.out.println("getValue方法得到: username = " + this.username + ", password = " + this.password);
}

public static void main(String[] args) throws Exception {
final DirtyRead dr = new DirtyRead();
Thread t1 = new Thread(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
dr.setValue("lhy", "456");
}
});
t1.start();
Thread.sleep(1000);
dr.getValue();
}
}

  4.1 setValue/getValue方法同时加锁synchronized同步关键字