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What is the use of the final keyword, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

The final keyword is mainly used in three places: variables, methods, and classes.

For a final variable, if it is a variable of a basic data type, its value cannot be changed once initialized; if it is a variable of a reference type, it cannot point to another object after initialization.

When you modify a class with final, it indicates that the class cannot be inherited. All member methods in the final class are implicitly specified as final methods.

There are two reasons for using the final method. The first reason is to lock the method to prevent any inherited class from changing its meaning; the second reason is efficiency. In earlier versions of the Java implementation, the final method was converted to an inline call. But if the method is too large, you may not see any performance gains from embedded calls (the current version of Java no longer needs to use the final method for these optimizations). All private methods in the class are implicitly specified as final.

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