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

Core Java Interview Questions

Questions Answers Views Company eMail

if i have one string class then how can you achive this class functionality of this class?

Fidelity, iFlex,

3 7813

can abstract class have constructor how can you achive this ?

Fidelity,

4 10965

what is difference betwwen hashmap and hashtable ?

Fidelity,

7 12288

we know that every java prog must follows OOPS Principles. Anybody can answer, HOW THE FOLLOWING PROGRAM FOLLOWS OOPS CONCEPTS i.e, Inheritance,Polymarphism,Encapsulation? class a{ public static void main(String args[]){ System.out.println("Hello World"); } }

3 8259

is memory to the abstract class allocated ..or objects not instantiated

Synechron, TCS,

7 23708

where the static methods will live ,on stack ? can you explain brefly

1 3378

how to write a server program and sending the mails to the server using smtp protocol please help me

Lampex,

1 2125

how to write a program for sending mails between client and server

Lampex,

1 2131

how to write a program for chat function using core java

Satyam,

1 5188

why abstract class will have a constructor?

4 8551

how to run ecllipse with jettyserver for windows environment using batch file

1 2173

can we Connect Applet to Data Base ? with Discriptiom. and also What is Diff. from Applet & Servlet?

Systematix,

1 4991

basic difference b/w ALL types of JDBC driver.

Systematix,

1 5855

perpare on factorypattern,linklist wothout using collection, (multitharding ie create producer/customer therad producer create Queue continuesly,consumer consume queue, consumer wait if queue is full,producer wait if queue is empty),diff betn sleep(1000)&wait(1000) these r the main Q ask in huawei(2008)

Huawei,

1 5627

what is meaning of JIT?

4 10341

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Un-Answered Questions { Core Java }

What are the differences between heap and stack memory in java?

1112

Write a program to find the whether a number is an Armstrong number or not?

1085

Differentiate between static and non-static methods in java.

1106

What is the difference between break and continue statements?

1107

What is an object in java and how is it created?

1110

What is a constructor overloading in java?

1113

Realized?

2239

What is the difference between equals() and == in java?

1021

What is parsing in java?

1022

Explain public static void main(string args[]) in java.

1053

What is java string pool?

1068

What is a classloader in java?

1072

explain different ways of using thread? : Java thread

1068

What do you mean by an interface in java?

1084

Write a java program to find the route that connects between Red and Green Cells. General Rules for traversal 1. You can traverse from one cell to another vertically, horizontally or diagonally. 2. You cannot traverse through Black cells. 3. There should be only one Red and Green cell and at least one of each should be present. Otherwise the array is invalid. 4. You cannot revisit a cell that you have already traversed. 5. The maze need not be in the same as given in the above example

2649

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