What are the principles and techniques of java concurrent programming?

Principles and techniques of concurrent programming

1. Single responsibility principle. Separate concurrency-related code from other code.
　2. Limit data scope. Two threads may interfere with each other when modifying the same field of a shared object, leading to unpredictable behavior. One solution is to construct critical sections, but the number of critical sections must be limited.
　3. Use data copies. Data copies are a good way to avoid sharing data; copied objects are treated as read-only.
　4. Threads should be as independent as possible. Let threads exist in their own world and not share data with other threads.

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