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 14471

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

Wipro,

1 5710

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 5913

how to call one program .class file in another program

TCS,

7 10092

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

ME,

4 6505

what are literals in java?

2 5110

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 6972

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

2 5582

What is basic concept of static in java ?

iGate,

1 6387

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

Polaris,

1 3552

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

Oracle,

1 3872

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

Mphasis,

2757

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

3i Infotech,

1 3191

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

3i Infotech,

1 4027

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

3i Infotech,

1 4164

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Un-Answered Questions { Core Java }

What are the 3 types of loops in java?

987

If two threads have same priority which thread will be executed first ?

1413

How many bits are used to represent unicode, ascii, utf-16, and utf-8 characters in java programming?

956

Can I declare a class as private?

1017

Is vector synchronized in java?

936

What are checked exceptions?

965

What do you understand by the term singleton?

940

What is an off by one error in java?

896

What is the size of boolean variable?

1024

Why pass by reference is not possible in java?

963

What is abstract class? Explain

975

How to print nodes of a Binary tree?

2198

Can a class be private in java?

942

What are memory tables?

1053

Write an algorithm for quick sort?

967

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