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

Core Java Interview Questions

Questions Answers Views Company eMail

when System.out.println("") is executed what happens in the back ground?

2 5338

why do we use interface in java?

5 9677

Urgent requirement of JAVA/.NET/QA in a CMMI level3 MNC for Pune location.

2375

when to for abstract class and when to go for interface

2 4592

how to print a numbers from 1 to 100 with out using control structures?

IBM,

4 7291

whats the difference between == and .equal ?

Cisco,

10 16036

what is meant by package in java?

5 11304

class A { private int i; } class B extends A { private int i; } if I create an object of B class what will be the memory of that object.

Yamaha,

2 8519

how to fing linkedlist is circular or not?

TCS,

1 4008

what is the main class of all the classes

Photon,

5 7874

what are the boundaries of jdk and jre?

CoreObjects,

2086

How will you measure that int takes up only 32 bits in memory?

Rolta,

2 5777

Map map = new HashMap(2); map.add(“1”,”one”); map.add(“2”,”two”); map.add(“3”,”three”); What will happen at this line?

Rolta,

5 16009

Write down program for following scenario. Use java coding standard. You have array list with some words in it..we will call it as dictionary….and you have a arbitrary string containing some chars in it. You have to go through each word of dictionary and find out if that word can be constructed with the help of chars from arbitrary string given. If you find the word print it else print none.

Rolta,

2732

Can we iterate through collection using for loop?

Rolta,

2 6175

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Un-Answered Questions { Core Java }

What is difference between array and vector?

1086

can rmi and corba based applications interact ?

1084

What is pass by value?

945

How to display all the prime numbers between 1 and n (n is the number, get the input from user)

980

What happens when you add a double value to a string?

989

what is object slice?

2084

What is covariant return type?

1113

What are advantages of exception handling in java?

1024

What is final method in java?

1033

What are 4 pillers of object orinted programming?

1017

What is an array length?

904

What is methods and methodology?

1029

What state is a thread in when it is executing?

962

Describe how to implement singleton design pattern in struts.

1005

Differentiate between run time error and syntax error.

1132

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