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 5237

why do we use interface in java?

5 9487

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

2343

when to for abstract class and when to go for interface

2 4488

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

IBM,

4 7132

whats the difference between == and .equal ?

Cisco,

10 15740

what is meant by package in java?

5 11119

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 8417

how to fing linkedlist is circular or not?

TCS,

1 3939

what is the main class of all the classes

Photon,

5 7689

what are the boundaries of jdk and jre?

CoreObjects,

2050

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

Rolta,

2 5672

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 15787

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,

2681

Can we iterate through collection using for loop?

Rolta,

2 6092

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Un-Answered Questions { Core Java }

What is variable declaration and definition?

974

What is getclass () getname () in java?

1112

What are scalar data types?

1004

Is it possible to cast an int value into a byte variable? What would happen if the value of int is larger than byte?

918

Explain treeset?

1060

How do you control extraneous variables?

868

Can a class extends itself in java?

986

Why java is platform independent? Explain.

963

What are the advantages of user defined functions?

953

Is java code slower than native code?

1016

What are pass by reference and pass by value?

944

What are generic methods?

925

Why java is made?

930

What is the advantage of OOP in java?

1095

State the merge-sort principle and its time complexity.

936

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