Are you looking for the interview questions and answer of Core Java for Experienced or Freshers, then you are at the right place. As per the market research the 10.1% of the total jobs in IT industry is covered by Java Technologies. Java is very good Option for career in IT sector. So you can prepare for JAVA Jobs.
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List of Top Java Interview Questions
Here we are providing a list of Core Java Interview Questions and answers which will help you to crack the Java Interview easily & fulfill your dream career as a Core Java Developer or Advanced Java Developer.
What is the full form of OOPS?
Object oriented programming language.
What are the basic and principle concepts of OOPS?
Following are the four basic principle concepts of OOPS which you must have knowledge before learning about Java.
- Abstraction
- Polymorphism
- Inheritance
- Encapsulation
(Shortcut => To remember these names easily you can use the work A-PIE)
What is Encapsulation?
Encapsulation is a technique of Java which is used for hiding the behavior and properties of an object and allow that to access outside only as appropriate. It prevent the direct access of the encapsulated object by the other objects.
What is Inheritance?
The process by which an objects of one class acquire the properties of other objects of another class.
What is Super Class?
The inherited class is called a Super Class.
Explain the Abstraction in OOPS?
The process of representing all the special features without telling the background details or explanations.
What is the difference between Abstraction and Encapsulation?
| Abstraction | Encapsulation |
| 1. Abstraction work as interface and mainly focuses on the outside view of an object. 2. It solved the design side problems 3. Encapsulation is the deliverables of Abstraction. | 1. Encapsulation hides the inside view from the user (information hiding) where we implements the Abstraction. 2. It solve the Implementation. 3. It rarely talks about grouping up of abstraction to suit the developer needs. |
What is Java?
- Java is an object programming language.
- Compatible with Multiple Platforms.
- Developed by Sun Micro-systems.
- Due to its special structures it is perfect for programs on the Internet.
What is the meaning of ‘Static’ in Java?
Static is the non-accessible modifier of Java. Static is applicable for the following;
- Blocks
- Variables
- Methods
- Nested Classes