synchronized修饰方法，保证数据同步准确性，限制线程互斥访问

港控/mmm° 2022-08-06 16:25 6阅读 0赞

1.未加synchronized关键，造成访问顺序混乱

package thread;
    
    /**
     * @author xiaolong.zhu.baby@qq.com created on 2015/2/6.
     */
    public class Test extends Thread { public void jump() { for (int i = 0; i < 100; i++) { if(i%10==0)
                    System.out.println();
                System.out.print(" "+this.currentThread().getName() + ":" + i + "\t"+" ");
            } } @Override
        public void run() { jump();
        } public static void main(String[] args) { Test test = new Test();
            Thread a = new Thread(test, "A");
            Thread b = new Thread(test, "B");
            a.start();
            b.start();
        } }

运行结果：

![Center][]

2. 添加synchronized进行互斥访问可以解决数据不同步的问题

package thread;
    
    /**
     * @author xiaolong.zhu.baby@qq.com created on 2015/2/6.
     */
    public class Test extends Thread { public synchronized void jump() { for (int i = 0; i < 100; i++) { if(i%10==0)
                    System.out.println();
                System.out.print(" "+this.currentThread().getName() + ":" + i + "\t"+" ");
            } } @Override
        public void run() { jump();
        } public static void main(String[] args) { Test test = new Test();
            Thread a = new Thread(test, "A");
            Thread b = new Thread(test, "B");
            a.start();
            b.start();
        } }

运行结果：

![Center 1][]

总结：使用了synchronized可以使一个线程运行完synchronized所修饰的方法，其他需要排队等候，可以保证数据的准确性。

[Center]: /images/20220805/685942206c3545b988c1d248d2c4a71c.png
[Center 1]: /images/20220805/657f94e227584f2eae3477d106c5e8a3.png