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

Core Java Interview Questions

Questions Answers Views Company eMail

what is the need of the Ajax?

iFlex,

5 8781

I want to know the host name and provider name for tcs web mail

RSG, TCS,

5 19585

How Array List can be Serialized.

Polaris,

7 15462

Why we use static and synchronized in method for single thread model example: public static synchronized add(){}

2 6424

what is main difference b/w abstract class and interface

4 8355

if arraylist size is increased from initial size what is the size of arraylist...suppose initial is 100 , if i add 101 element what is the size...

10 33481

why interfaces are faster than abstract classes?

4 20497

how to call a method in different package?

4 20928

How to create two different thread class inside a main function?

1 5281

why String class is immutable.

iGate,

5 13990

How to sort a vector elements that contains the user define class object? (Note: If Suppose consider, A Student class contain two data members. They are String studentName and int rollNo. I am creating Four objects for this class, each object contains students details like name and roll no. Now i am storing that objects in vector and if i retiving the elements from the vector means then it should be display in sorting order)

ProdEx Technologies,

3 9001

what is aberivation of java?

14 19705

explain about jre and jvm

2 7480

what is difference between abstract and interface? can i give real time example for the two topics?

7 13438

Is java is a fully object object oriented language?

TCS,

31 38311

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Un-Answered Questions { Core Java }

Why is string class considered immutable?

1112

What is the difference between import java.util.date and java .util?

1104

What is toarray method in java?

1169

Is ruby built on java?

992

What is public static?

1089

Is a class subclass of itself?

1136

What is Java Shutdown Hook?

1267

Difference between == and .equals() ?

1042

What is difference between equal and == in java?

1008

What is the difference between synchronized and synchronized block?

1110

What 5 doubled?

1049

What is output buffer?

1095

How java enabled high performance?

1097

What is the return type of the main method?

1092

What is integer valueof?

1169

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