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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 63102

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 9808

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

Wipro,

7 10515

What is an abstract class?

DBS, Wipro,

7 9255

How can final class be used?

Accenture, Wipro,

5 11132

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

Wipro,

1 11957

Java support what type of parameter passing ?

Wipro,

7 13730

Explain the term serialization?

Wipro,

10 11699

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

Infosys, Wipro,

10 13304

What is Overriding and how can it be used?

Consagous, Wipro,

7 15317

Explain pass by reference and pass by value?

IBM, Wipro,

8 13881

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 9204

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 42431

Is there any need to import java.lang package?

Sun Microsystems,

13 17336

What is UNICODE?

3 5391


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Un-Answered Questions { Core Java }

What is JDBC Driver interface?How can you retrieve data from the ResultSet

1116


What is anagram of a string?

102


Is there a case when finally will not execute?

134


What is main method?

123


Can we extend private class in java?

108






Explain the difference between map and flatmap stream operation?

201


Why string is popular hashmap key in java?

170


What does the exclamation mark mean in java?

112


How to declare an arraylist in java?

94


How strings are created in java?

118


What is functional interface in javatpoint?

106


Does apple use java?

113


What is the purpose of the enableevents() method?

151


What does the “static” keyword mean?

140


Why Set interface contains unique elements, what internally implemented for this so that it contains unique elements?

6699