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Q&A
Top curated interview packs
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Coding rounds
Top 10 sets
Beginner
1. What is Java?
Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems.
Beginner
2. What are the main features of Java?
Simple, Object-Oriented, Platform Independent, Secure, Robust, Multithreaded, Distributed.
Beginner
3. What is JVM?
JVM (Java Virtual Machine) executes Java bytecode and makes Java platform independent.
Beginner
4. What is JDK?
JDK (Java Development Kit) provides tools to develop Java applications including compiler and JVM.
Beginner
5. What is JRE?
JRE (Java Runtime Environment) provides libraries and JVM to run Java applications.
Beginner
6. What is OOP?
Object-Oriented Programming is a paradigm based on objects and classNamees.
Beginner
7. What are OOP principles?
Encapsulation, Abstraction, Inheritance, Polymorphism.
Beginner
8. What is a className?
A className is a blueprint to create objects.
Beginner
9. What is an object?
An object is an instance of a className.
Beginner
10. What is constructor?
A constructor initializes objects and has the same name as the className.
Beginner
1. What is Java?
Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems.
Beginner
2. What are the main features of Java?
Simple, Object-Oriented, Platform Independent, Secure, Robust, Multithreaded, Distributed.
Beginner
3. What is JVM?
JVM (Java Virtual Machine) executes Java bytecode and makes Java platform independent.
Beginner
4. What is JDK?
JDK (Java Development Kit) provides tools to develop Java applications including compiler and JVM.
Beginner
5. What is JRE?
JRE (Java Runtime Environment) provides libraries and JVM to run Java applications.
Beginner
6. What is OOP?
Object-Oriented Programming is a paradigm based on objects and classNamees.
Beginner
7. What are OOP principles?
Encapsulation, Abstraction, Inheritance, Polymorphism.
Beginner
8. What is a className?
A className is a blueprint to create objects.
Beginner
9. What is an object?
An object is an instance of a className.
Beginner
10. What is constructor?
A constructor initializes objects and has the same name as the className.
Intermediate
11. What is method overloading?
Multiple methods with same name but different parameters.
Intermediate
12. What is method overriding?
Redefining parent className method in child className.
Intermediate
13. What is inheritance?
Mechanism where one className acquires properties of another.
Intermediate
14. What is polymorphism?
Ability of object to take multiple forms.
Intermediate
15. What is abstraction?
Hiding implementation details and showing only functionality.
Intermediate
16. What is encapsulation?
Binding data and methods together in a single unit.
Intermediate
17. What is interface?
Blueprint of a className with abstract methods.
Intermediate
18. What is abstract className?
className that cannot be instantiated and may contain abstract methods.
Intermediate
19. What is String immutable?
String objects cannot be changed after creation.
Intermediate
20. Difference between ArrayList and LinkedList?
ArrayList uses dynamic array, LinkedList uses doubly linked list.
Round 1 - Technical
46. Explain HashMap internal working.
HashMap uses hashing mechanism. It stores key-value pairs using hashcode and equals method.
Round 2 - Coding
47. Reverse a string in Java.
Using StringBuilder reverse() method.
Round 3 - OOP
48. Explain SOLID principles.
Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, Dependency Inversion.
HR Round
49. Why should we hire you?
Because of strong Java fundamentals, problem-solving skills and teamwork.
Managerial Round
50. How do you handle deadlines?
By prioritizing tasks, proper planning and efficient execution.