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 have a abstract class withought any method? What is a purspose of this?

3 6663

Howto get an object that will perform date & time calculations then format it for output in some different locales with different date style.can ne1 tel me the answer of this question.pls

1975

What is the difference between throw and throws?

Cap Gemini,

5 13479

I have an HashMap object, which has with key and value pair. It has 10 keys and values in that object. Now the question is I want insert new key and value in middle or any where in that list but not at the end or at the top. Is it possible or not. If yes how can we achieve this one?

Huawei,

2 7387

How can we handle runtime exceptions? write one sample program? Can we write runtime exceptions beside the throws key word? if yes write sample program?

Huawei,

1 7595

We are seeing so many videos/audios as many web sited. But question is these videos or audios are stored in Databases ( Oracle, Mysql, Sybase,... ) or stored any file directory from there they will give the link for that? Pls explain and give sample code to achieve this one? Thanks, Seenu.

Symphony,

2003

JSP is by default thread safe or not? what is the meaning of isThreadSafe="true" and isThreadSafe="false". Explain it? Thanks, Seenu

Huawei,

9 31812

Write program to print Hello World and print each character address in that string and print how many times each character is in that string? Ex: H: 0 & 1 e:1 & 1 l :2,3,8 & 3 o:4,6 & 2 w:5 & 1 r: 7 & 1 d 9 & 1

Huawei, IBM,

7 13467

how to know the total memory occupied by the objects in the ArrayList(Array list may contain duplicate objects)

Infosys, TCS,

2393

"We cannot create an object of interface but we can create a variable of it". Discuss the statement with the help of an example. (Plz help us to provide immediately.)

3 11081

Create a form of user Login in JSP, that accepts the user name and password from user and authenticate it with user names and passwords stored in database. (Plz provide me answer immediately)

ABC,

1 11865

what is diffrence between .NET and java?

2 5263

Read data from console and print in one file. That would be in C:\temp ? Thanks, Bose

Oracle, Surya Software,

3 8265

I have one POJO class(Java bean class), it has two variables for that it has setters and getters. Now i have created two objects for that class and i have set the data for those variables through this two objects. Now question is i want check whether those two objects have same data or not, for this write a program? Thanks, Bose.

Oracle,

2 16736

what is real-time example of runtime polymorphism and compile time polymorphism

SLK Group,

4 43691

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Un-Answered Questions { Core Java }

What is java util list?

1038

What is busy spin, and why should you use it?

1132

How to check if a list is sorted in java?

1092

Why is the singleton pattern considered to be an anti pattern?

953

What is the difference between a vector & an array list?

1222

How many bytes is a string java?

1083

What is flag in python?

1083

When is the finalize() called?

1236

List some features of the abstract class.

1123

What lambda means?

1068

What are untrusted applets?

1206

What are scalar data types?

1134

Can java list be null?

1042

What is the use of volatile in java?

1116

Does a function need a return?

1010

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