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由浅入深，Java 并发编程中的 Synchronized（一）-私信我获取Java中高级资料
source link: https://blog.51cto.com/14482848/2561998
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synchronized作用synchronized关键字是Java并发编程中线程同步的常用手段之一。1.1作用：确保线程互斥的访问同步代，锁自动释放，多个线程操作同个代码块或函数必须排队获得锁，保证共享变量的修改能够及时可见，获得锁的线程操作完毕后会将所数据刷新到共享内存区；不解决重排序，但保证有序性。1.2用法：修饰实例方法synchronized关键词作用在方法的前面，用来锁定方法，其实默认
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