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 5993

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,

2119

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,

2105

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,

2212

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 5409

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 5344

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

Accenture,

2 6379

what is the use of StringBuffer?

Accenture,

2 6492

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 4341

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

2 5375

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

L&T,

3 7575

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

L&T,

3 9180

why java uses class level type casting ?

2619

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,

2372

where can we get jAVA project orientation traing in HYDERABD

1952

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Un-Answered Questions { Core Java }

What is return keyword in java?

1015

Which eclipse is best for java?

962

What is string pooling concept?

1008

What is append function?

951

What does microservices mean?

905

What is length in java?

969

Which java collection does not allow null?

1100

What are constants and how to create constants in java?

947

Explain the difference between treeset and treemap in java?

932

How many types of flags are there?

963

Can final class have constructor?

871

How many types of operators are there?

934

Which collection does not allow duplicates in java?

931

explain the concept of virtual method invocation in polymorphism in detail?

2165

What is dynamic array in java?

973

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