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

Core Java Interview Questions

Questions Answers Views Company eMail

Is it possible to create Userdefined Unchecked Exception also?If Yes, give an example?

ADP,

2 7961

What is JIT ?

Satyam,

4 8029

can we add two numbers without using arthematic operators? if possible how?

CTS,

5 8030

why the equals method can be override?when we override the equals method?

5 9510

why the wait,notify,notifyall methods are placed in object class?these are the thread concepts why these methods are placed in Object class?

Global Logic, Satyam,

2 10527

using equals method overriding which objects are compared?i.e same class objects or other class objects?Explain me.

4 4786

If set accepts only one argument then how can it compare two objects to avoid duplicates

5 5506

can u override the start() method of Thread class

5 18482

which method throws exception of type Throwable

2 4614

can u handle an error if u write Thowable in the catch class lise try { some errorneous code }catch(Throwable e){ ...}

4 6609

how to convert mm/dd/yy to dd/mm/yy using collections in java.

Bosch,

4 11020

how do you store phone numbers using java collections

Bosch, IBAB,

5 17188

which one is performance wise advantageious from List,Set,Map?

6 10607

string is immutable? right every one knows that, my question is it advantage or disadvantage making string immutable?

HCL,

5 9328

What is difference between hash mapping and hash table?

NDS, Wipro,

5 8981

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Un-Answered Questions { Core Java }

Is constructor inherited?

520

What is the role of garbage collector in java?

479

What is the difference between exception and error in java?

482

Why singleton is not thread safe?

555

What is the difference between call by reference and call by pointer?

486

What are different exception types exceptions available in java ?

467

What is the difference between replace and replace all?

461

What environment variables do I need to set on my machine in order to be able to run java programs?

586

Is it possible to use string in the switch case?

543

Why volatile is used in java?

517

What is an association?

538

What is the method in java?

583

If two threads have same priority which thread will be executed first ?

830

How many bytes are a float?

495

What is split return?

483

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