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 14689

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

Wipro,

1 5813

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 6059

how to call one program .class file in another program

TCS,

7 10427

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

ME,

4 6693

what are literals in java?

2 5236

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 7118

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

2 5698

What is basic concept of static in java ?

iGate,

1 6484

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

Polaris,

1 3685

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

Oracle,

1 3968

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

Mphasis,

2820

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

3i Infotech,

1 3280

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

3i Infotech,

1 4141

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

3i Infotech,

1 4275

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Un-Answered Questions { Core Java }

What is the difference between actual and formal parameters?

945

How can we access some class in another class in java?

993

What does java se mean?

1027

When super keyword is used?

1009

What is the use of default method in interface in java? Explain

1006

Can we create constructor in abstract class ?

1059

Are maps ordered java?

958

How is Object Oriented Programming different from Procedure Oriented Programming?

1049

Why is core java important?

1041

Define a java class.

1440

Why does java have different data types for integers and floating-point values?

1012

Does .length start 0 java?

1008

What are the 4 types of characters?

1014

How is it possible for two string objects with identical values not to be equal under the == operator?

992

Which is the best approach for creating thread ?

1216

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