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

Core Java Interview Questions

Questions Answers Views Company eMail

which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?

HP, SparkTG,

6 11019

how tha garbage collector know that the object will be deleted? on which algorithm the garbage collector works? what is the working principle of garbage collector? How manay types of garbage collectors r there?

HP, SparkTG,

1 7214

what is object type casting? give some example with related?

HP, SparkTG,

2 8913

suppose we have an interface & that interface contains five methods. if a class implements that interface then we have to bound that to give tha definition of all five methods in that class. If we declare that class as abstract then can we call only two methods to give the deinition of that method & i don't want to give the definition of all the methods? can it possible

HP, Wipro,

6 10013

Why java is not a pure object oriented language?

IBM,

5 8638

why java is platform independent?

IBM, SparkTG,

5 7954

how to run servlet program between two computer through the internet ?

Kiran Prakashan, TCS,

2 6796

can you use the two main method in same class?how?

DELL, Geosoft, SparkTG,

4 10742

java program that takes a 3 digit number n and finds out whether the number 2^n + 1 is prime, or if it is not prime find out its factors.

HCL, Wipro,

7 9994

When we give defination of interface method in the class why method must be public???

2 4602

How many types of syncronization?

2 4989

What is race condition ?? (Threading concept) TCS 2 sept10

SparkTG, TCS,

3 7673

why we write public static void main (String args[]) in core java plz explain briefly??????????????????

HCL,

3 8382

diffrence b\w println() and printf()

NIIT,

8 23214

if we give input as " hi how are you" then the output should be "uoy woh"...it should skip odd words in the input and should reverse even words from the end of string...can anyone help me to write this program in java

1 4088

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Un-Answered Questions { Core Java }

Where is java located?

993

Can we have more than one package statement in the source file?

1029

What are the two types of java programming?

1016

What are synchronized methods ?

1063

Can we use return in constructor?

900

What is static import in java?

956

What is a ternary operator in java? What is an interface?

962

What is the difference between method overriding and overloading?

1189

How to sort an unsorted array in java?

1087

Can we write class inside a class in java?

930

Describe what a thread-local variable is in java?

974

What is the different types of functions?

1006

What is replacefirst in java?

1047

What's the default access specifier for variables and methods of a class?

1070

Can we convert stringbuffer to string?

963

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