What does java final mean?

In Java, final means immutability, including that final classes cannot be inherited, final methods cannot be overridden, and final variables are constants and cannot be changed. Benefits of using final include improved security, performance, and readability. Final should be used in scenarios where there is no need to inherit, change the implementation, or change the value.

The meaning of final in Java

What is final?

In Java, final is a keyword that indicates that a class, method or variable cannot be changed, that is, once their value or state is set, it cannot be changed.

The meaning of final class

• A class declared as final cannot be inherited.
• All methods in a final class are implicitly declared final.

The meaning of final method

• A method declared as final cannot be overridden by a subclass.
• The implementation of final methods is unchangeable.

The meaning of final variables

• A variable declared as final is a constant and its value cannot be changed.
• final variables must be initialized when declared.

Benefits of using final

The benefits of using the final keyword include:

• Enhanced security:final classes and methods prevent inappropriate inheritance or overriding.
• Improve performance: Final variables can be inlined by the compiler, thereby improving performance.
• Improve readability: The final keyword clearly indicates immutability, making the code easier to understand.

When to use final?

Final should be used in the following situations:

• When a class does not need to be inherited.
• When the implementation of a method should not be changed.
• When the value of a variable should not be changed.

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