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 13176

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

Wipro,

1 5128

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 5059

how to call one program .class file in another program

TCS,

7 8368

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

ME,

4 5056

what are literals in java?

2 4119

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 5901

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

2 4659

What is basic concept of static in java ?

iGate,

1 5682

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

Polaris,

1 2883

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

Oracle,

1 3196

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

Mphasis,

2371

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

3i Infotech,

1 2612

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

3i Infotech,

1 3374

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

3i Infotech,

1 3472

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Un-Answered Questions { Core Java }

Can a class be a super class and a sub-class at the same time? Give example.

800

What data type is a string?

513

a thread is runnable, how does that work? : Java thread

512

Is java free for commercial?

491

What are parsing rules?

500

What is a programming object?

556

Write a program to print all permutations of string?

677

What are the 6 boolean operators?

552

Is a case study a method or methodology?

464

What is return type in java?

630

Why chararray() is preferred over string to store the password?

526

Explain the difference between association, aggregation and inheritance relationships.

555

What is the use of flag?

583

What invokes a thread's run() method in java programming?

569

Do we need to manually write Copy Constructor?

606

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