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Core Java Interview Questions
Questions Answers Views Company eMail

What is garbage collection in Java, and how can it be used ?

Accenture, HCL, Infosys, Sara, SITS, TCS, Wipro,

32 71634

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 12621

Differentiate constructor and a method and how are it be used?

Wipro,

7 13348

What is an abstract class?

DBS, Wipro,

7 11920

How can final class be used?

Accenture, Wipro,

5 13033

By what default value is an object reference declared as an instance variable?

Wipro,

1 13021

Java support what type of parameter passing ?

Wipro,

7 16253

Explain the term serialization?

Wipro,

10 14477

Is there is any error if you have multiple main methods in the same class?

Infosys, Wipro,

10 16412

What is Overriding and how can it be used?

Consagous, Wipro,

7 17591

Explain pass by reference and pass by value?

IBM, Wipro,

8 16578

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 11081

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 51739

Is there any need to import java.lang package?

Sun Microsystems,

13 20435

What is UNICODE?

 3 6400

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Un-Answered Questions { Core Java }

What is polymorphism in java? What are the kinds of polymorphism?

438

Make a data structure and implement an algorithm to print all the files in a directory. (The root directory can have sub-directories too.)

699

Which browsers work with java?

441

Why is static used?

415

What is the purpose of lambda expressions?

438




What is a hashmap used for?

476

Write a program to print the pattern given below

370

What do negative exponents mean?

428

What is java basic concept?

389

Which is better stringbuilder or stringbuffer?

410

What is difference between identifier and variable?

340

Is array an object in java?

424

What is use of inner class in java?

397

What is are packages?

451

What are scriptlets?

472

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