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

Core Java Interview Questions

Questions Answers Views Company eMail

Can we instantiate Interfaces?

Ericsson,

7 15258

What do you mean by the term transient?

Ericsson,

5 11238

What are the two ways you can synchronize a block of code?

Ericsson,

5 13868

Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?

Ericsson,

7 11027

How can you sort dates?

TCS,

2 9181

Why to give the file name same as the public class name in java?

3 7026

Is there any use of an abstract class which has no methods and no attributes?

Wipro,

1 4835

If your team member writes code with lots of static variables and static methods, will it cause any side effects?

KPIT,

3 7411

If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?

KPIT,

5 8697

I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?

KPIT,

3 6738

There is a Banking application. It has 2 types of account, Savings and Current. Write a method calculateInterest by passing an ArrayList of these account objects and calculate Interest accordingly. Write code for this situation

ABC, KPIT,

1 3447

If two threads call a static method at the same point of time, what will happen?

KPIT,

3 8726

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

KPIT,

9 13442

There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?

KPIT,

6 10554

I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?

KPIT,

8 11499

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Un-Answered Questions { Core Java }

How listener identify that the event came from a particular object?

1963

How to use arraylist in java netbeans?

988

What is an object in java?

988

Can I uninstall java?

993

What is a buffer in java?

993

How do you start a new line in java?

942

What is default locale java?

1060

what is the difference between process and thread? : Java thread

941

Can we use String with switch case?

1131

How do you decide when to use arraylist and linkedlist?

955

What is the difference between serial and throughput garbage collector?

1048

Can interface be private in java?

959

What is synchronization and why is it important in java programming?

896

List types of storage classes in java?

1088

What is a vector in java?

984

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