The difference and use of static and final

Static

Modifier variables: Static variables are initialized as the class loads, only one in memory, and the JVM allocates only one memory at a time, and all classes share static variables.

Modification method: Exists at the time of class loading and does not depend on any instance; The static method must be implemented and cannot be decorated with an abstract.

Decorated code blocks: the contents of a code block are executed after the class has been loaded.

Parent class static code block--Subclass static code block--parent class non-static code block----child class non-static code block--subclass constructor method

Final

Modifier variables:

Compile-time constants: Initialization is done during class loading and is compiled into any calculation. Can only be a basic type.

Run-time constants: The base data type or the reference data type. The reference is immutable, but the referenced object content is mutable.

Modification method: Cannot be inherited, can not be modified quilt class.

Decorated class: Cannot be inherited.

Modifier parameters: The final parameter is immutable.