同步方法和块之间有什么区别? [英] What is the difference between synchronized methods and blocks?

问题描述

synchronized 方法和synchronized 声明之间有什么区别?

What is the difference between synchronized methods and synchronized statements?

如果可能的话，请使用示例使其更清楚.

If possible, please use an example to make it more clear.

推荐答案

同步方法锁定与该类的实例(即"this")或该类(如果是静态方法)关联的监视器，并阻止其他人执行因此，直到从方法返回为止.同步块可以锁定任何监视器(告诉您哪个监视器)，并且其作用域可以小于encolsing方法的作用域.

A synchronized method locks the monitor associated with the instance of the class (ie 'this') or the class (if a static method) and prevents others from doing so until the return from the method. A synchronized block can lock any monitor (you tell it which) and can have a scope smaller than that of the encolsing method.

如果同步块最终不等同于方法的整个范围，并且/或者如果它们锁定的东西比实例(或类，如果不是静态的)那么严酷，则首选同步块.

Synchronized blocks are prefered if they don't end up equivalent to the entire scope of the method and/or if they lock something less draconian than the instance (or class if static).

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