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 97732

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 29142

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

Wipro,

7 29780

What is an abstract class?

DBS, Wipro,

8 28215

How can final class be used?

Accenture, Wipro,

5 27848

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

Wipro,

1 26787

Java support what type of parameter passing ?

Wipro,

7 20689

Explain the term serialization?

Wipro,

10 32078

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

Infosys, Wipro,

10 34219

What is Overriding and how can it be used?

Consagous, Wipro,

7 33767

Explain pass by reference and pass by value?

IBM, Wipro,

8 33045

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 25885

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 75852

Is there any need to import java.lang package?

Sun Microsystems,

13 26334

What is UNICODE?

3 8876

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Un-Answered Questions { Core Java }

What is the difference between break and continue statements?

1133

What is java string pool?

1090

explain different ways of using thread? : Java thread

1091

What is a constructor overloading in java?

1132

How to sort array in descending order in java?

1001

What do you mean by an interface in java?

1107

What is the difference between equals() and == in java?

1049

Differentiate between static and non-static methods in java.

1134

Write a program to print count of empty strings in java 8?

1092

What is parsing in java?

1050

Realized?

2275

What is a classloader in java?

1098

How to create a base64 decoder in java8?

1151

What is an object in java and how is it created?

1149

Write a program to find the whether a number is an Armstrong number or not?

1107

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