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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 6085

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

Gspann Technologies, Merrill Lynch, Polaris,

9 39254

What is the purpose of premetive data types in java?

Merrill Lynch, TCS,

2 8385

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

TCS,

7 14779

What is the basic functionality of DataOutput interface in java?

TCS,

2 6288

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

iGate,

9 19914

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

College School Exams Tests, Infosys,

13 21494

What is the difference between overloading and overriding a function?

eG Innovations, Infosys, TCS,

13 24695

when we have to use final class in java?

2 7890

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

2 4718

Life Cycle of Thread

IBM,

4 11292

what is the difference between Cpp And Java

Infosys,

15 28428

what is the use of reference variable

6 22982

What is unicode?

5 9972


Post New Core Java Questions

Un-Answered Questions { Core Java }

how to convert Java project into Maven ?

1109


What is meant by class loader? How many types are there? When will we use them?

1015


How the interruptible method gets implemented?

1031


What is anti pattern in programming?

1017


Explain the importance of join() method in thread class?

1142


Is arraylist dynamic in java?

1060


When is finally block not called?

1155


What are the different types of constructor?

1046


when a request is generated from apache tomcat 5.5 and goes to oracle 10g or mysql,,, how the oracle or mysql reads the request as apache is a web server and oracle 10g is application server? when the oracle 10g provides response, how the apche tomcat reads it???

2228


Say you want to store the information about a number of pets in an array. Typical information that you could store for each pet (where relevant) would be • Breed of animal • Animal's name • Its birth date • Its sex • Whether it has been sterilised or not • When it is due for its next inoculation • When it last had its wings clipped For each type of pet (eg. dog, cat or bird) you would typically define a class to hold the relevant data. Note: You do not need to implement these classes. Just answer the following questions. 3.1.1 What would be the advantage of creating a superclass (eg. Pet) and declaring an array of Pet objects over simply using an array of Objects, storing each of the instances of the different pet classes (eg. Dog, Cat or Bird) in it? 3.1.2 Would you define Pet as a class or as an interface? Why? (2) (2)

1878


Is null a string in java?

1173


What is the method overriding?

1120


I am unable to find or learn about print command. I have a graphical program in core java in applet but i want to give print command but i have coding for that so if anyone know about this plz mail me on avdhesh_chauhan007@yahoo.co.in

2159


Why we use methods in java?

1049


Why are lists ordered in java?

1069