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Core Java Interview Questions
Questions Answers Views Company eMail

What is an empty class? What functionality does it offer in Java?

Deloitte, EXL, JPMorgan Chase,

1286

Give any two differences between C++ and java.

GrapeCity,

1156

What do you mean by Hash Map and Hash Table?

Atos Origin,

1106

Why is String immutable?

Atos Origin,

1074

What is a local block?

Global Logic,

1153

What do you mean by exception handling in Java?

Atos Origin,

1303

What are dot operator queries?

Atos Origin,

1116

What are annotations in java?

Impetus,

1104

What is the use of a copy constructor?

Flextronics,

999

How we can declare a static variable?

HCL,

1118

Write a function to print Fibonacci series and Tribonacci series?

Hexaware,

1188

How we create object in copy constructor?

HCL,

1134

Do we need to manually write Copy Constructor?

HCL,

1042

Why declare Main() inside the class in java ?

HCL,

1079

What is the use of using enum to declare a constant?

Fidelity,

1037

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Un-Answered Questions { Core Java }

Is break statement can be used as labels in java?

977

what are Hostile Applets?

2094

What is data member in java?

1068

2) Suppose there are 5 directories having lot of files (say txt files) in each directory. 2 things :- 2.1) You want to search for filenames which have a particular pattern. 2.2) Out of these filtered files you want to search for a particular keyword or a search string. How can you achieve this?

2285

What is gui programming?

1048

What is the differences between c++ and java? Explain

1060

What is a numeric digit?

1095

Explain, java is compatible with all servers but not all browsers?

1074

What is an abstract class and what is it’s purpose?

967

What is method overriding in java ?

1202

How to change value in arraylist java?

1190

What is the length of a string?

1042

What is tree in java?

940

There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

1499

Difference between static and dynamic class loading.

1139

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