package com.bjsxt.base.sync004;
/**
* 业务整体需要使用完整的synchronized,保持业务的原子性。
* @author alienware
*
*/
public class DirtyRead {
private String username = "bjsxt";
private String password = "123";
public synchronized void setValue(String username, String password){
this.username = username;
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.password = password;
System.out.println("setValue最终结果:username = " + username + " , password = " + password);
}
/**synchronized**/
public 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() {
dr.setValue("z3", "456");
}
});
t1.start();
Thread.sleep(1000);
dr.getValue();
}
}
/**
* 业务整体需要使用完整的synchronized,保持业务的原子性。
* @author alienware
*
*/
public class DirtyRead {
private String username = "bjsxt";
private String password = "123";
public synchronized void setValue(String username, String password){
this.username = username;
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.password = password;
System.out.println("setValue最终结果:username = " + username + " , password = " + password);
}
/**synchronized**/
public 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() {
dr.setValue("z3", "456");
}
});
t1.start();
Thread.sleep(1000);
dr.getValue();
}
}
本文通过一个 DirtyRead 示例展示了Java并发编程中可能出现的脏读问题。示例中,synchronized关键字用于保证部分操作的原子性,但整体业务仍存在并发风险。在main方法中创建了两个线程,一个设置值,一个获取值,揭示了在不完整同步情况下,数据一致性可能被破坏的问题。
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