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

Core Java Interview Questions

Questions Answers Views Company eMail

In method overloading ,if i change the return type to Long instead of INT,is the program execute

HCL,

6 11756

wat is class level lock and object level lock

HCL, Persistent,

3 22239

is it possible to add a object in a HASHMAP

HCL,

6 9799

why we cannot declare static variable inside a static method

4 9830

why using interface interface ?

2047

why use interface? if interface declear a method implement in class. why direct implement method in class

HCL,

1 2808

different between exception and error? explaim check and uncheck exception

4 7425

Difference between interface and abstract class with ex.

Cognizant, Tech Mahindra,

4 9619

what is Thread priority?

Tech Mahindra, Wipro,

4 8078

Distinguish method overloading and overriding

Tech Mahindra,

2 5704

Distinguish method overloading and method overriding

Tech Mahindra,

4 7407

What is thread priority?

Tech Mahindra,

1 5764

Why Over riding is Run Time Polymorphism?

Genpact,

3 16032

How many objects are created when we create String class object using new operator?

Mind Tree,

9 27576

What is onClassLoader in java?

Cap Gemini,

5 9865

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Un-Answered Questions { Core Java }

How is hashset defined in java?

1040

How do you square a number in java?

1056

What is data movement?

1139

What are the changes in java.io in java 8 ?

1033

What is the difference between an inner class and a sub-class?

1019

How can I right-justify a string?

1181

What is unicode datatype?

966

How is treeset implemented in java?

1028

What is the use of inner class?

1046

What are class types in java?

1078

Is it possible for yielded thread to get chance for its execution again ?

1031

Is logger a singleton?

950

Is java a compiler?

986

What are multiple inheritances? Is it supported by java?

952

What is ascii format?

994

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