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

Core Java Interview Questions

Questions Answers Views Company eMail

java program with complete 4 oops concepts implemented example

Infosys, NIIT,

3100

what is platform independence in java?

CSC, HSBC,

5 8493

if num=687; U have to get num=6+8+7;

CMC,

4 6074

there are some duplicate values in ArrayList, how U'll get that array with out duplicate?

CMC,

4 9127

in a console we r giving java if r pressing enter where it'll goes

CSC,

2 4829

Can we extend the String class?

Truworth,

3 25289

we r taking 0 1 in deployment descripter for loading servlets like serv1 N serv2? so 'll it take serv1 or serv2

CSC,

2 7415

what are the different non-access specifiers in java?

5 11915

java Technical questions asked by JPMC

JPMorgan Chase,

5002

what are variables in java

Wipro,

7 9135

What is multithreading ???? How to stop multithrading in java????

Cognizant,

1 5294

Suppose there is an array list [10,5,20,19,15,24].Print them in ascending & descending order in collection framework concept ???

Cognizant,

2 6953

What will happen if we cannot mention "finally" in Java Program ???

PWC,

3 7067

What is default specifier ??? Use of default specifier ???

Cognizant, Syntel,

4 8350

write a program to create an arraylist with string(add,remove) operation.and value should be enter through keyboard.

Axcend,

2122

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Un-Answered Questions { Core Java }

What is a singleton factory?

918

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

2372

Explain when we should make an instance variable private.

1054

Write a code to create a trigger to call a stored procedure

921

How do you remove all elements from an arraylist in java?

958

When throws keyword is used?

956

How transient variable is different from volatile variable?

1031

What is final keyword in java? Give an example.

968

What is a default constructor and also define copy contrucyor?

1053

Difference between static and dynamic class loading.

1064

How can you handle java exceptions?

975

What are the types of inner classes (non-static nested class) used in java?

1019

What are java packages? What's the significance of packages?

1234

Is void a keyword in java?

970

What is an interoperable application in java ?

959

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