OOPS

Here is the index for Java OOPS concepts

OOPS Concepts

• OOPS Principle in Java
• Java – Various ways to create Object- 4 ways
• Java – Declaration, Definition, Initialization and Instantiation, Instance of class

Method Overloading and Overriding

• Java Overriding – Widening and narrowing for access modifier, return type and exception handling
• Java – Method Overloading
• Java – Method Overriding v/s Method Overloading
• Java – Interview Question and Answers on Method Overriding
• Java – Interview Question and Answers on Method Overloading

Constructor

• Java – Constructor with example
• Java – Default Constructor with example
• Java – Parametrized Constructor with example
• Java – Default constructor v/s Parametrized constructor

Constructor Overloading

• Java – Constructor overloading with example

Constructor Chaining

• Java – Constructor chaining with example

Constructor Questions

• Java – Method v/s Constructor
• Java – Private Constructor
• Java – Static Constructor, a big interview question ?
• Java – Interview Question and Answers on Constructor

Interface in Java 8

• Java 8 – Constructor in Interface, a tricky question post Java 8 release
• Java 8 – default and static methods in Interface
• Java – Interview Question and Answers on Interface
• Java 8 – Interface interview question and answers

Initialization Blocks

• Java – Initialization blocks
• Java – Constructors, Initialization blocks and their execution order
• Java – Static Initialization blocks v/s Instance Initialization blocks
• Java – Why the execution order of Constructor and Initialization blocks is pre-defined?

Abstract Classes and Methods

• Java – Abstract classes and methods with example
• Java – Interview Question and Answers on Abstract Classes & Methods
• Java – Interface v/s Abstract Classes

Java Keywords

• Java – instanceof operator or keyword
• Java – final keyword
• Java – static keyword
• Java – this keyword
• Java – super keyword
• Java – Interview Question and Answers on final keyword

Design Patterns

• Java – Singleton design pattern, restricting all 4 ways of Object creation
• Java – How to construct an immutable class
• Java Interview – How to create Thread-safe Singleton class ?

Java Interview Programs

• Java – Throw exception when second instance is created
• Java – Why do we use “public static void main” only ?

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