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

Core Java Interview Questions

Questions Answers Views Company eMail

Does 'true' and 'false' are keywords?

5 9020

As a developer what steps do you take to improve the performance?

4 7930

Can Applet have constructors?

Infosys,

5 27752

Can an exception be rethrown?

Wipro,

4 14204

Can try statements be nested?

Wipro,

3 9198

Can we access a database using applets?

Hewitt,

2 7732

Can you extend more than one interface?

9 23560

Can you have a constructor in abstract class?

HCL,

18 53980

Can you have an inner class inside a method and what variables can you access?

2 8575

Can you run the product development on all operating systems ?

1 6527

what are Checked & Unchecked exceptions ?

2 8036

What will happens if you opened Internet Explorer 4 times?

2 5955

What is the default modifier in Interface?

5 14612

Define Compiling?

3 6895

Difference between canvas class & graphics class?

1 9439

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Un-Answered Questions { Core Java }

Why does java have two ways to create child threads?

954

What do you mean by constant time complexity?

1247

How do you replace a string in java?

1004

What is java and why do we need it? Explain

1138

When is the finally clause of a try-catch-finally statement executed?

1070

What class allows you to read objects directly from a stream?

1320

How do you compare values in java?

1030

What do you mean by platform independence?

1053

Why can't we use static class instead of singleton?

945

What is hashmap in java?

1057

What does java final mean?

1038

What is an example of a boolean?

1063

What is <> used for in java?

1115

What is stringreader?

977

Give differences between Quicksort & Mergesort. When should these sorts be used and what is their running time?

1068

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