Interview Questions and Answers for 'T' | Search Interview Question

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Q871. Name few long data type related classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-data-types-long-classes-and.html

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Q872. Name few String related classes and interfaces ?

Core Java

Ans. http://www.buggybread.com/2015/01/java-string-classes-and-interfaces.html

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Q873. Name few Queue classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-collections-queue-classes-and.html

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Q874. What are few iterator classes provided by Java ?

Ans. http://www.buggybread.com/2015/01/java-iterator-classes-and-interfaces.html

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Q875. Name few Writer classes ?

Ans. http://www.buggybread.com/2015/01/java-output-writer-classes-and.html

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Q876. Name few Reader classes ?

Ans. http://www.buggybread.com/2015/01/java-input-reader-classes-and-interfaces.html

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Q877. Name few Error and Exception classes provided by Java ?

Ans. http://www.buggybread.com/2015/01/java-list-of-error-exception-classes.html

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Q878. Name few classes that are part of java.util package ?

Ans. http://www.buggybread.com/2015/01/java-javautil-classes-and-interfaces.html

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Q879. Name few Java util classes that were introduced with Java 7 ?

Ans. http://www.buggybread.com/2015/01/migrating-to-java-7-new-classes_25.html

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Q880. Name few Java Util classes introduced with Java 8 ?

Core Java

Ans. http://www.buggybread.com/2015/01/migrating-to-java-8-new-classes_25.html

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Q881. What is the difference betweeen @Inject and @Autowired ?

Spring

Ans. @Autowired and @Inject are similar in terms of functionality they achieve. @Inject is part of a new Java technology called CDI that defines a standard for dependency injection whereas @Autowired is a Spring specific annotation for dependency injection.

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Q882. How to make sure that a string contains only Numerals ?

Core Java

Ans. We can use NumberUtils.isNumber which is a part of apache commons package.

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Q883. What is Jenkins ?

Jenkins

Ans. It is a continuous integration tool written in Java.

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Q884. Do you know the way to remove unused imports automatically in eclipse ?

Eclipse

Ans. Select the package -> Right Click -> Source -> Organize Imports.

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Q885. What is Nagios ?

Ans. Nagios is open source system , network and infrastructure monitoring software application. It alerts the user if anything goes wrong. Nagios is widely used as monitoring tool for enterprise applications.

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Q886. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?

Spring

Ans. No, if required we should only have final variables.Bean scoped singleton means that only one instance of the bean will be created and will be shared among different requests and hence instance variables will get shared too.

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Q887. What is the difference between Fisheye and Crucible ?

Ans. FishEye is used to extract information from source code repository whereas Crucible is used to request, perform and manage code reviews.

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Q888. Can we use Fisheye and Crucible independently ?

Ans. Yes

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Q889. What is atlassian Jira ?

Ans. Jira is a Issue / Ticket Management system developed by atlassian. It assists in Defect Management , Issue Management and Project Management.

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Frequently asked in Tata Consultancy (TCS) interview ( Based on 2 Feedback )

Q890. What are the technologies used in Jira ?

Tools

Ans. JIRA is written in Java and uses the Pico IOC container,Apache OFBiz entity engine, and WebWork technology stack. For remote procedure calls (RPC), JIRA supports REST, SOAP, and XML RPC.

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Q891. Which are SCM's can be integrated with Jira ?

Ans. Clearcase, CVS, Git, Mercurial, Perforce, Subversion and Team Foundation Server

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Q892. What are the different types of boards in Jira ?

Ans. Scrum boards are for teams that plan their work in Sprints.

Kanban boards are for teams that focus on managing and constraining unplanned work.

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Q893. What is a Board in Jira ?

Ans. We need a board to work with issues in JIRA Agile. A Board can display issues from one or more projects.

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Q894. What is Jira Workflow ?

Ans. A JIRA workflow is the set of statuses and transitions that an issue goes through during its lifecycle.

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Q895. What is the Jira workflow used in your project ?

Ans. We are using the following workflow with the following Issue states

Open -> Assigned -> In Progress -> QA -> Resolved -> Closed

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Q896. What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?

Object Oriented Programming

Ans. Stateless objects are the objects without instance fields (instance variables). The class may have compile time constants i.e static final fields.Immutable objects are the objects which have state but the state cannot be changed after initialization. Both are Thread safe.

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Q897. What are advantages of stateless and / or immutable objects ?

Object Oriented Programming

Ans. They can be shared across multiple threads as they are thread safe.

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Q898. Write code explaining use of Scanner class ?

Ans. Scanner sc = new Scanner(System.in);
int i = sc.nextInt();

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Q899. In which cases isn't instanceof operator a bad practice?

Core Java

Ans. To avoid ClassCastException.

Though the following code will compile fine but will result in ClassCastException during runtime.

Fruit fruit = new Apple();
Banana banana = Banana(fruit); // ClassCastException

This code will not give compile time error as Banana and Fruit are related as Banana either extends or implement Fruit, So downcasting is acceptable. With this code we assume that the Fruit handler will have the Apple object at that point, violating which the code will throw the exception.

This exception can be avoided by following code.

Fruit fruit = new Apple();
if(fruit instanceOf Banana){
Banana banana = Banana(fruit); // ClassCastException
}

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Try 2 Question(s) Test

Q900. Difference between Scanner and BufferedReader ? Which one is faster and Why ?

Core Java

Ans. Scanner is used for parsing tokens from the contents of the stream while BufferedReader just reads the stream.

BufferedReader read files efficiently by using a buffer to avoid physical disk operations.

Buffer size of Scanner is usually smaller than the Buffered Writer.

BufferedReader is faster that Scanner as it just reads the Stream and doesn't Parse the tokens to read the stream into primitive data types.

Sample Code for Scanner

Sample Code for BufferedReader

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