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Inheritance
• Defines a IS-A relationship between classes.
• Base classes and derived classes.
• Derived class inherits all fields and methods of base class.
• Derived class objects are type compatible with base class.
• protected fields and methods: visible to derived classes and to
classes in same package.
• inheritance is transitive.
• polymorphism allows for redefining fields and methods.
• dynamic binding allows for run-time determination of
overloads and/or overrides.
• super() is a way to refer to constructor of base class.
It can also be called  using appropriate parameters.
It can only be the first line of a constructor.
• super with appropriate parameters is also used to
invoke the corresponding method of the base class.