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Can final keyword be used for a method?
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What are the three different uses of final keyword in java? Create Constants, prevent inheritance, and prevent methods from being inheritance are the three main uses of final keyword in java.
In Java, the final keyword can be used while declaring an entity. Using the final keyword means that the value can't be modified in the future. This entity can be - but is not limited to - a variable, a class or a method.
You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses.
Absolutely! The final keyword can be applied to just about anything, in each case meaning "you don't get to change this anymore."
Here's what it means when applied to...
a variable: You simply cannot assign the variable a new value (rendering it a constant, of course)
a method: You cannot re-implement (i.e., override) this method in a subclass
a class: You cannot define a subclass
In each case we're simply indicating: once this thing is declared, this is the last value (or implementation) you'll ever see for it.
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Yes, it is possible to declare a method as final. That will mean that a method cannot be overridden by its subclasses.
From The Java Language Specifications, Third Edition, Section 8.4.3.3:
A method can be declared final to prevent subclasses from overriding or hiding it. It is a compile-time error to attempt to override or hide a final method.
For more information, the Writing Final Classes and Methods page from The Java Tutorials has more information.
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