JPA 1 - Module 4: Object Oriented Programming

Notes: https://javajee.com/book/java-core-object-oriented-programming

Topic 1: Inheritance

  1. Create class Abc in a package with a protected variable. Create another class Def in another package extending the class Abc and print the value of inherited protected variable.

Question sets:

With answers: set-20set-22

Without answers: set-21

Topic 2: Abstraction

  1. Create an interface InterA with a single method. Create a class that implement that interface.

  2. Create an Abstract class with one abstract and one concrete method. Create a concrete child class that extend the abstract class.

Question sets:

With answers: set-23set-25

Without answers: set-24

Topic 3: Casting and instanceof

  1. Write a program to demonstrate casting. Create class Abc. Create class Def that extend from Abc. Create a method m1() that print "I am m1 in Def" only in Def. Create an object of Def and assign it to a reference of Abc. Use casting to invoke the method m1() using the reference of type Abc using casting.

Question sets:

With answers: set-26

Without answers: set-27

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