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Explain the scope of the following variables in Java:

  1. Local variables
  2. Parameter variables
  3. Instance variables
  4. Class variables

Encapsulation & Inheritance in Java

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Answer

  1. Local variables — The scope of local variables is limited to the method or the block they are declared in. So, local variables are accessible only to the method or block in which they are declared. They are not accessible to the rest of the class.
  2. Parameter variables — The scope of parameter variables is limited to the method where they are being used. Therefore, parameter variables are visible only to the method in which they are used. They are not accessible to the rest of the class.
  3. Instance variables — The scope of an instance variable is within the object that it belongs to, and it can be accessed from any method of the class that it belongs to, within the visibility restrictions defined by its access modifiers.
  4. Class variables — A class variable can be accessed from any instance of the class using the class name followed by the variable name. It is shared among all instances of a class. It is available as a single copy to all instances of the class.

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