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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 65978

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 10727

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

Wipro,

7 11454

What is an abstract class?

DBS, Wipro,

7 10058

How can final class be used?

Accenture, Wipro,

5 11831

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

Wipro,

1 12316

Java support what type of parameter passing ?

Wipro,

7 14657

Explain the term serialization?

Wipro,

10 12613

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

Infosys, Wipro,

10 14458

What is Overriding and how can it be used?

Consagous, Wipro,

7 16089

Explain pass by reference and pass by value?

IBM, Wipro,

8 14774

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 9835

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 46007

Is there any need to import java.lang package?

Sun Microsystems,

13 18472

What is UNICODE?

3 5753


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Un-Answered Questions { Core Java }

Can you declare a private method as static?

329


Explain treeset?

265


How can we access some class in another class in java?

254


What is sizeof () operator?

256


What is a literal coding?

232






How many bytes is double?

231


What is += mean in java?

236


Is java a digit method?

225


What is the collections api?

260


What is the core java?

227


What do you meant by active and passive objects?

295


What is java algorithm?

208


How many types of constructors are used in java?

241


What is the purpose of using the java bean?

251


What is Gang of four design patterns

299