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

Core Java Interview Questions

Questions Answers Views Company eMail

How to decrease number of hashings in has

1 3728

Is it safe for adding 10,00,000 records/objects to HashMap?, i.e is it safe to add millions of objects to HashMap?

2 5874

What is the difference between pageContext and page implicit objects in jsp?

Gspann Technologies, Merrill Lynch, Polaris,

9 38669

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 8152

Howmany number of objects we can store in an ArrayList. Is there any limit?

TCS,

7 14336

What is the basic functionality of DataOutput interface in java?

TCS,

2 6053

Can we inherit the constructor in a Class?please give one example.

iGate,

9 19332

Why do we use public static with the main function in Java?

College School Exams Tests, Infosys,

13 20627

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 23828

when we have to use final class in java?

2 7722

how to minimize the functionality to will not force garbage collector?

2 4469

Life Cycle of Thread

IBM,

4 10961

what is the difference between Cpp And Java

Infosys,

15 27459

what is the use of reference variable

6 22493

What is unicode?

5 9578

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Un-Answered Questions { Core Java }

1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE VARIABLE,WE CAN USE THE DIFFERENT DEFINED OBJECT DIRECTLY TO ACCESS THE DATA MEMBER AND MEMBER FUNCTION OF THAT RESPECTIVE CLASS?WHAT IS THE MAIN FUNCTION OF "REFERENCE VARIABLE" HERE?

4841

What is the use of parseint in java?

985

Why does java does not support multiple inheritance? Explain

934

What is a null class?

931

How do you reverse sort in java?

906

How would you convert bytes to string?

946

Is there a case when finally will not execute?

961

Is static a singleton?

932

what is object-oriented programming in java?

1004

Give me example of derived data types.

1102

Is sizeof a preprocessor?

951

Can subclass overriding method declare an exception if parent class method doesn't throw an exception?

1012

What is length in java?

969

What are the benefits of operations?

905

What does three dots mean in java?

1070

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