What is final modifier?

• final can be used in 3 ways
  1.variables,constants are final:we cannot change the value during the execution.
  2.methods are final:if we mention method as final we cannot extend that method.
  3.classes are final:if we mention the class is final we cannot inherit the properties of that class.
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• Final variable cannot be changed and final classes cannot be inherited
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• final int a=9;//means value of a cannot be modified
  final class xyz{}// means this class cannot be inherited
  final public void display()// means this method cannot be overriden
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