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Java interview questions and answers for freshers Page 8

(#M40029437) JAVA QUESTION java Keep an EYE

Q. What is a native method?

A. A native method is a method that is implemented in a language other than Java.

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(#M40029436) JAVA QUESTION java Keep an EYE

Q. Briefly explain daemon thread.

A. Daemon thread is a low priority thread which runs in the background performs garbage collection operation for the java runtime system

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(#M40029435) JAVA QUESTION java Keep an EYE

Q. Where pragma is used?

A. Pragma is used inside the servlets in the header with a certain value. The value is of no-cache that tells that a servlets is acting as a proxy and it has to forward request. Pragma directives allow the compiler to use machine and operating system features while keeping the overall functionality with the Java language. These are different for different compilers.

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(#M40029434) JAVA QUESTION java Keep an EYE

Q. What is the purpose of apache tomcat?

A. Apache server is a standalone server that is used to test servlets and create JSP pages. It is free and open source that is integrated in the Apache web server. It is fast, reliable server to configure the applications but it is hard to install. It is a servlet container that includes tools to configure and manage the server to run the applications. It can also be configured by editing XML configuration files.

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(#M40029433) JAVA QUESTION java Keep an EYE

Q. What is JSP?

A. JSP is a technology that returns dynamic content to the Web client using HTML, XML and JAVA elements. JSP page looks like a HTML page but is a servlet. It contains Presentation logic and business logic of a web application.

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(#M40029431) JAVA QUESTION java Keep an EYE

Q. Difference between static and dynamic class loading.

A. Static class loading: The process of loading a class using new operator is called static class loading. Dynamic class loading: The process of loading a class at runtime is called dynamic class loading. Dynamic class loading can be done by using Class.forName()newInstance()

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(#M40029432) JAVA QUESTION java Keep an EYE

Q. Explain the Common use of EJB

A. The EJBs can be used to incorporate business logic in a web-centric application.
The EJBs can be used to integrate business processes in Business-to-business (B2B) e-commerce applications.In Enterprise Application Integration applications, EJBs can be used to house processing and mapping between different applications.

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(#M40029430) JAVA QUESTION java Keep an EYE

Q. What is memory leak?

A. A memory leak is where an unreferenced object that will never be used again still hangs around in memory and doesnt get garbage collected

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(#M40029429) JAVA QUESTION java Keep an EYE

Q. What is the List interface?

A. The List interface provides support for ordered collections of objects. Lists may contain duplicate elements.

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(#M40029428) JAVA QUESTION java Keep an EYE

Q. What is an Iterator ?

A. The Iterator interface is used to step through the elements of a Collection. Iterators let you process each element of a Collection. Iterators are a generic way to go through all the elements of a Collection no matter how it is organized. Iterator is an Interface implemented a different way for every Collection

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