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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