How to deal with java concurrency issues

How to solve the dirty data problem caused by concurrency?

1. Use synchronized to play the role of synchronous locking. First, you can add the synchronized keyword to the class method to represent the method lock

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2. You can also use the synchronized keyword to declare a synchronized block

3. Yes Use the volatile keyword to declare class attributes. The principle is to synchronize the thread memory to the main memory immediately, that is, visible to all threads

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