Java synchronized static methods: lock on object or class

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Just to add a little detail to Oscar’s (pleasingly succinct!) answer, the relevant section on the Java Language Specification is 8.4.3.6, ‘synchronized Methods’:

A synchronized method acquires a monitor (ยง17.1) before it executes. For a class (static) method, the monitor associated with the Class object for the method’s class is used. For an instance method, the monitor associated with this (the object for which the method was invoked) is used.

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