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 5451

why do we use interface in java?

5 9835

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

2449

when to for abstract class and when to go for interface

2 4683

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

IBM,

4 7425

whats the difference between == and .equal ?

Cisco,

10 16360

what is meant by package in java?

5 11520

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 8643

how to fing linkedlist is circular or not?

TCS,

1 4071

what is the main class of all the classes

Photon,

5 8026

what are the boundaries of jdk and jre?

CoreObjects,

2125

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

Rolta,

2 5869

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 16193

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,

2786

Can we iterate through collection using for loop?

Rolta,

2 6279

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Un-Answered Questions { Core Java }

What is nextline method in java?

1093

Explain what access modifiers can be used for methods?

1124

What is static method with example?

1255

How is abstraction implemented in java ?

1096

What are the rules for variable declaration?

1015

Can java program run without jre?

1064

What does the @override annotation do?

1094

What is java used for on a computer?

1038

Can an abstract class be a final class?

1047

What is treeset in java collection?

1013

When a byte datatype is used?

2353

What is callablestatement? How you can call stored procedure to pass in parameter?

1068

Can we override final method?

1068

How does sublist works in java?

1028

Can we force the garbage collection to run?

1002

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