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

Core Java Interview Questions

Questions Answers Views Company eMail

Why java is free from garbage values??

4 13146

what is singlton class?where it is use in real time senario.

Wipro,

1 5110

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 5036

how to call one program .class file in another program

TCS,

7 8323

What is the difference(or similarity if there are some) between object and a variable?

ME,

4 5024

what are literals in java?

2 4090

When we r go to abstract class and when we go to Interface? i have confusion this question while in interview plz clarify

HCL, Photon,

3 5869

When should I use abstract classes and when should I use interfaces?

2 4630

What is basic concept of static in java ?

iGate,

1 5651

What is the difference between static synchronize() metod and synchronize() method?

Polaris,

1 2856

How can we get one Interface methods whit out using implementation of interface

Oracle,

1 3168

Why wait(),notify(),notifyAll() methods defined in Object class althought we are using in only threads.

Mphasis,

2356

can we write two same methods in outer class and innerclass.

3i Infotech,

1 2582

can we take more than one null values for Unique constraints.

3i Infotech,

1 3349

what is the main differene between synchronize() method and Synchronize{}block?

3i Infotech,

1 3445

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Un-Answered Questions { Core Java }

Is overriding possible in java?

493

What is Recursion Function?

626

Why hashcode is used in java?

485

What are internal and external variables?

532

What does it mean that strings are immutable?

559

Is there any case when finally will not be executed?

514

Explain what access modifiers can be used for variables?

579

How much is a java license?

511

Why lambda expression is used in java?

555

What do you mean by hashing?

635

List out benefits of object oriented programming language?

470

How are variables stored?

521

What is difference between pointer and reference?

496

what is singleton in java?

586

What is re-factoring in software?

565

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