What should you pay attention to when using the final keyword?

You need to pay attention to the following issues when using the final keyword:

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1. Classes modified by final cannot be inherited;

2. Methods modified by final cannot be overridden;

3. Variables modified by final cannot be changed. If Modifying the reference means that the reference is immutable and the content pointed to by the reference is variable;

4. The JVM will try to inline the method modified by final to improve operating efficiency;

5. Constants modified by final will be stored in the constant pool during the compilation phase;

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Pair a final field in the constructor The writing and subsequent assignment of a reference to the constructed object to a reference variable cannot be reordered between these two operations.

The first read of a reference to an object containing a final field and the subsequent first read of the final field cannot be reordered between the two operations.

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