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 6379

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

1864

What is the difference between throw and throws?

Cap Gemini,

5 13028

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 7155

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 7394

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,

1892

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

Huawei,

9 31236

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 13003

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 10797

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 11707

what is diffrence between .NET and java?

2 5054

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

Oracle, Surya Software,

3 7958

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 16505

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

SLK Group,

4 43311

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Un-Answered Questions { Core Java }

Can we convert list to set in java?

926

What are user defined exceptions?

974

Can we use string in the switch case?

995

Is it possible to compare various strings with the help of == operator?

942

Is object a data type?

922

What is the difference between the paint() and repaint() methods in java programming?

1138

What is boolean example?

905

How can constructor chaining be done using this keyword?

1220

What is the difference between numeric and integer?

957

What is a JAR file?

995

What is the difference between an interface and an abstract class?

965

Can we have multiple catch block for a try block?

947

Is void a data type in java?

931

What are the differences between stringbuffer and stringbuilder?

1009

Hi.... I applied for the post of scientific officer/Engineer-SB(Programmer).Please post the syllabus and sample papers.

1956

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