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 6395

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

1866

What is the difference between throw and throws?

Cap Gemini,

5 13054

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 7162

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 7405

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,

1898

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

Huawei,

9 31269

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 13018

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

Infosys, TCS,

2289

"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 10814

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 11712

what is diffrence between .NET and java?

2 5064

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

Oracle, Surya Software,

3 7964

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 16519

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

SLK Group,

4 43329

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Un-Answered Questions { Core Java }

What is string example?

1007

What is the difference between Java and C++?

1136

Can a constructor call another constructor?

939

If an object is garbage collected, can it become reachable again?

959

Can a class be private?

922

Can we change the scope of the overridden method in the subclass?

1337

Explain notifyall() method of object class ?

1056

How do you trim a space in java?

937

What is the class in java?

977

Can a boolean be null java?

934

What are the two ways of implementing multi-threading in java?

1444

What is the implementation of destroy method in java. Is it native or java code?

914

What is printwriter in java?

919

When is finally block not called?

1031

What are the differences between the constructors and methods?

1061

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