Final (Java)

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In the Java programming language, the final keyword is used in several different contexts to define an entity which cannot later be changed.

A final class cannot be subclassed. This is done for reasons of security or efficiency. Accordingly, many of the Java standard library classes are final, for example and . All methods in a final class are implicitly final.

Example:

public final class MyFinalClass

A final method cannot be overridden by subclasses. This is done for reasons of efficiency, since the method can then be placed inline wherever it is called.

Example:

public class MyClass 
}

A final variable is a constant. It must be assigned a value at declaration, and the variable can later be used but not assigned a new value. Local variables (for example, variables in loops) cannot be declared final.

Example:

public class MyClass

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