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 3921

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 6084

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

Gspann Technologies, Merrill Lynch, Polaris,

9 39247

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 8383

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

TCS,

7 14776

What is the basic functionality of DataOutput interface in java?

TCS,

2 6286

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

iGate,

9 19911

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

College School Exams Tests, Infosys,

13 21486

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 24685

when we have to use final class in java?

2 7890

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

2 4716

Life Cycle of Thread

IBM,

4 11289

what is the difference between Cpp And Java

Infosys,

15 28423

what is the use of reference variable

6 22973

What is unicode?

5 9968

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Un-Answered Questions { Core Java }

Why hashset is used in java?

1124

Is string is a keyword in java?

1037

Explain about varargs in java?

1189

How list contains works in java?

1051

Is oracle charging for java?

1089

What does int [] mean in java?

1103

What are the differences between wait() and sleep()?

1064

What languages are pass by reference?

1111

How do you sort arrays in java?

990

which pattern is default in scanner package?

2273

What is the difference between the file and randomaccessfile classes?

1165

When to use runnable interface vs thread class in java?

1043

Differentiate between static and non-static methods in java.

1102

What is gc()?

1141

What are the fileinputstream and fileoutputstream?

1107

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