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

Core Java Interview Questions

Questions Answers Views Company eMail

SAP Labs,

2 6225

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???

SAP Labs,

2224

how we can use debug in myeclipse 6.0 in order solve the problems that exist in our program when there are 900 to 1000 pages in a web application

SAP Labs,

2201

what is the role of xml in core java?? and how we can use it?? can somebody give a sample program with explanation and from where i can read more about xml?????

HCL, SAP Labs, Vital Soft,

2321

In a my eclipse editor if i want to switch from jdk 1.4 to jdk 1.6 how to do that???? Initially i have jdk1.4

Tech Mahindra,

1 5554

for(i=0;i<100;i++) { int i=method();//method returns no's from 1 to 10; /* insert some stmts which can give output like no.of times numbers(1-10) returned. (for example if it returns 2 then i want output how many times 2 returned) like that i want output for no's 1 - 10 how many times each no returned. */ }

3 5615

how come we know the object is no more used in the class?

Accenture,

2 6559

what is the use of StringBuffer?

Accenture,

2 6693

what value will be return by the read() method once it reaches the end-of-file? a. Throws EOException b. Return null c. Return -1 d. Read method return nothing, because it is void method

1 4509

An inner class can actually be a subclass of the outer class? a. true b. false

2 5649

WHAT IS MARKER INTERFACE,AND NO METHODS IS NOT THERE ON THAT INTERFACE THEN WHY WE USED IN JAVA?

L&T,

3 7873

Is it possible to do method overloading and overriding at a time

L&T,

3 9471

why java uses class level type casting ?

2706

how a programmer confirms that the data submitted has been succesfully inserted into the database(either oracle or my sql).. How a programmer confirm if there is any problem with the program he wrote for insertion... ANS:--- >executeupdate method is having boolean return type, if anything goes wrong in data insertion or data updation, it would return false. otherwise, if it successfully inserts data into the database, it would return true NOW HOW TO I CHECK IN MY DURING EXECUTION WHETHER IT RETURNS TRUE OR FALSE... WELL IT WILL DISPLAY ANY MESSAGE OR NOT

Google,

2486

where can we get jAVA project orientation traing in HYDERABD

2069

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Un-Answered Questions { Core Java }

java Technical questions asked by JPMC

5146

what is ststic with example

2124

Explain the importance of finalize() method.

1024

What is a short in java?

1125

String class is defined under which package in java?

1143

What are annotations in java?

1139

what is thread in Java ?

1211

How many bytes is a unicode character?

1063

Why is string builder not thread safe?

1127

Explain about wait() method?

1075

What is preparedstatement in java?

1105

What are loops in java? What are three types of loops?

1079

Lowest Common ancestor in a Binary Search Tree and Binary Tree.

986

Are maps ordered java?

1002

What is the purpose of the system class in java?

1100

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