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Core Java Interview Questions
Questions Answers Views Company eMail

How to decrease number of hashings in has

 1 3068

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 5121

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

Gspann Technologies, Merrill Lynch, Polaris,

9 36103

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 7138

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

TCS,

7 12399

What is the basic functionality of DataOutput interface in java?

TCS,

2 5147

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

iGate,

9 16926

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

College School Exams Tests, Infosys,

13 17061

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 20210

when we have to use final class in java?

 2 6907

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

 2 3552

Life Cycle of Thread

IBM,

4 9575

what is the difference between Cpp And Java

Infosys,

15 23356

what is the use of reference variable

 6 20408

What is unicode?

 5 8273

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Un-Answered Questions { Core Java }

Is 0 true or false in java?

509

How is treeset implemented in java?

476

What are accessor methods in java?

538

How can we find the actual size of an object on the heap?

794

What is the file extension for java?

592




Why hashmap is used in java?

532

How many types of voids are there?

519

How can a gui component handle its own events?

578

What are different types of arrays?

514

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

830

What are internal variables?

541

What is the difference between @before and @beforeclass annotation?

522

What is hashmap in java?

554

What is the difference between sleep and wait in java?

500

Explain about static imports in java?

582

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