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 9682

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 7292

whats the difference between == and .equal ?

Cisco,

10 16042

what is meant by package in java?

5 11306

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 8521

how to fing linkedlist is circular or not?

TCS,

1 4009

what is the main class of all the classes

Photon,

5 7876

what are the boundaries of jdk and jre?

CoreObjects,

2088

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

Rolta,

2 5779

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 16015

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,

2735

Can we iterate through collection using for loop?

Rolta,

2 6179

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Un-Answered Questions { Core Java }

what is enumset?

1126

What is keyword and identifier?

1136

What are constants?

1053

What are the different types of sorting in java?

980

What is the best definition for data?

971

Define iterator and methods in iterator?

968

What is exception in java?

1086

Does java support function overloading, pointers, structures, unions or linked lists?

1108

Explain what access modifiers can be used for variables?

1059

What is the format specifier?

940

What is use of map in java?

1013

Is null a string?

1003

How objects are stored in java?

1034

What is the use of default method in interface in java? Explain

1006

This abstract class is correct ? abstract class A { public abstract void Disp(); public abstract void B() { } public absract virtual C() { } }

989

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