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Core Java Interview Questions
Questions Answers Views Company eMail

What is the reason behind using constructors and destructors?

HCL,

554

Detail discussions on JVM, memory management and garbage collector.

Expedia,

550

How can we make a class virtual?

Fidelity,

640

What are the basic concepts of OOPS in java?

Axtria, ITC Indian Tobacco Company,

566

What is garbage collection? Can it be forced to run?

Global Logic,

539

Give differences between Quicksort & Mergesort. When should these sorts be used and what is their running time?

Genpact,

569

Write a function for palindrome and factorial and explain?

Honeywell, Huawei, Zomato,

654

What is the use of a conditional inclusion statement in Java ?

Global Logic,

586

Why main function is static?

MCN Solutions,

666

What are the characteristics of Final,Finally and Finalize keywords.

Flextronics,

701

How will you print number in reverse (descending) order in BST.

GrapeCity,

576

What is meant by data hiding in java?

Aspire, Infogain,

636

What is OOP Language?

Atos Origin,

625

Differentiate between postfix and prefix operators in java.

HCL,

639

Which are different kinds of source code?

 654

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Un-Answered Questions { Core Java }

Describe string intern() methodology

592

What are the Static and Dynamic Variables? Differentiate them.

600

What is merge sort in java?

579

Can we override static methods in java?

582

What is a jit compiler?

634




Explain the different forms of polymorphism?

566

Name some classes present in java.util.regex package.

602

What is keyword in oop?

518

Explain the available thread states in a high-level?

526

What are actual parameters?

520

Which method returns the length of a string?

564

How to handle a web browser resize operation?

541

What is an example of a boolean?

568

What is use of super keyword?

565

What do you mean by scope of variable?

480

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