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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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(#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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(#M40029424) JAVA QUESTION java Keep an EYE

Q. What is HashMap and Map?

A. Map is Interface and Hashmap is class that implements that.

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(#M40029422) JAVA QUESTION java Keep an EYE

Q. What is JIT and its use?

A. Really, just a very fast compiler In this incarnation, pretty much a one-pass compiler - no offline computations. So you can't look at the whole method, rank the expressions according to which ones are re-used the most, and then generate code. In theory terms, it's an on-line problem

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(#M40029421) JAVA QUESTION java Keep an EYE

Q. What is the purpose of Void class?

A. The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the primitive Java type void.

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(#M40029420) JAVA QUESTION java Keep an EYE

Q. What is mutable object and immutable object?

A. If a object value is changeable then we can call it as Mutable object. (Ex., String Buffer, If you are not allowed to change the value of an object, it is immutable object. (Ex., String, Integer, Float, -)

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(#M40029419) JAVA QUESTION java Keep an EYE

Q. What is the difference between yielding and sleeping?

A. When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.

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(#M40029418) JAVA QUESTION java Keep an EYE

Q. What is the purpose of finalization?

A. The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected. For example, closing a opened file, closing a opened database Connection.

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(#M40029417) JAVA QUESTION java Keep an EYE

Q. What is the difference between error and an exception?

A. An error is an irrecoverable condition occurring at runtime. Such as OutOfMemory error. These JVM errors and you can not repair them at runtime. While exceptions are conditions that occur because of bad input etc. e.g. FileNotFoundException will be thrown if the specified file does not exist. Or a NullPointerException will take place if you try using a null reference. In most of the cases it is possible to recover from an exception (probably by giving user a feedback for entering proper values etc.).

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