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 9999

wat is class level lock and object level lock

HCL, Persistent,

3 21052

is it possible to add a object in a HASHMAP

HCL,

6 8070

why we cannot declare static variable inside a static method

4 8211

why using interface interface ?

1504

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

HCL,

1 1987

different between exception and error? explaim check and uncheck exception

4 6004

Difference between interface and abstract class with ex.

Cognizant, Tech Mahindra,

4 8067

what is Thread priority?

Tech Mahindra, Wipro,

4 6560

Distinguish method overloading and overriding

Tech Mahindra,

2 4558

Distinguish method overloading and method overriding

Tech Mahindra,

4 5847

What is thread priority?

Tech Mahindra,

1 5017

Why Over riding is Run Time Polymorphism?

Genpact,

3 14592

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

Mind Tree,

9 24743

What is onClassLoader in java?

Cap Gemini,

5 7864

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Un-Answered Questions { Core Java }

What is java util?

537

Difference between final and effectively final ? Why is effectively final even required ?

552

What about main() method in java ?

565

Explain about anonymous inner classes in java?

578

How do constructors use this() and super()?

542

How many types of literals are there in JAVA?

591

What is the difference between heap memory and stack memory?

613

Can we increase size of array?

562

What's the default access specifier for variables and methods of a class?

510

Can finally block be used without a catch?

540

Explain different forms of polymorphism?

650

Explain all java features with real time examples

1204

When do we use synchronized blocks and advantages of using synchronized blocks?

659

Is list ordered in java?

538

What is immutability in java?

600

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