为了确保实现是线程安全的，实现该接口的类应该在方法上使用synchronized关键字，或者在方法内部使用同步锁。

To ensure that your implementation is thread-safe, a class that implements this interface should use either the synchronized keyword on the methods or synchronized blocks within the methods.

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为了确保实现是线程安全的，实现该接口的类应该在方法上使用synchronized关键字，或者在方法内部使用同步锁。

To ensure that your implementation is thread-safe, a class that implements this interface should use either the synchronized keyword on the methods or synchronized blocks within the methods.

youdao