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 11751

wat is class level lock and object level lock

HCL, Persistent,

3 22236

is it possible to add a object in a HASHMAP

HCL,

6 9796

why we cannot declare static variable inside a static method

4 9828

why using interface interface ?

2043

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

HCL,

1 2806

different between exception and error? explaim check and uncheck exception

4 7421

Difference between interface and abstract class with ex.

Cognizant, Tech Mahindra,

4 9616

what is Thread priority?

Tech Mahindra, Wipro,

4 8072

Distinguish method overloading and overriding

Tech Mahindra,

2 5702

Distinguish method overloading and method overriding

Tech Mahindra,

4 7403

What is thread priority?

Tech Mahindra,

1 5762

Why Over riding is Run Time Polymorphism?

Genpact,

3 16027

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

Mind Tree,

9 27570

What is onClassLoader in java?

Cap Gemini,

5 9857

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Un-Answered Questions { Core Java }

How do you check if a number is a perfect square?

992

What is scope & storage allocation of global and extern variables? Explain with an example

1042

How does arrays sort work in java?

1008

What is the exact difference in between Unicast and Multicast object?

2123

What is a Null object?

1636

What is the difference between sleep and wait in java?

966

Write a function for palindrome and factorial and explain?

1076

What is sortedset in java?

1025

Is arraylist ordered in java?

1115

What are java threads?

1131

Can we restart a dead thread in java?

987

What is a functional interface?

1038

What is singleton class in java and how can we make a class singleton?

1163

what is thread? : Java thread

983

Is string is a data type?

948

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