Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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 95864

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 28686

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

Wipro,

7 29347

What is an abstract class?

DBS, Wipro,

8 27746

How can final class be used?

Accenture, Wipro,

5 27477

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

Wipro,

1 26556

Java support what type of parameter passing ?

Wipro,

7 20203

Explain the term serialization?

Wipro,

10 31402

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

Infosys, Wipro,

10 33555

What is Overriding and how can it be used?

Consagous, Wipro,

7 33271

Explain pass by reference and pass by value?

IBM, Wipro,

8 32516

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 25480

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 74455

Is there any need to import java.lang package?

Sun Microsystems,

13 25592

What is UNICODE?

3 8596

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Un-Answered Questions { Core Java }

What is the difference between member variables initialization and assignment in a constructor?

1277

Is alive in java?

947

Can we define a package statement after the import statement in java?

1067

What is += mean in java?

999

What is a bubble sort in java?

947

Enlist few advantages of inheritance?

1075

What are constructors in java?

1117

What is class and object in java?

1005

How do you sort a set in java?

917

Is oracle charging for java?

1034

What is general methodology?

1038

Explain what is Marker interface?

1090

How can we create a thread in java?

1025

How many functional interfaces does java 8 have?

1028

How are variables stored in memory?

1074

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