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Frequently Asked Java interview questions and answers for freshers Page 18

(#M40029423) JAVA QUESTION java Keep an EYE

Q. What is nested class?

A. If all the methods of a inner class is static then it is a nested class

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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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(#M40029416) JAVA QUESTION java Keep an EYE

Q. What are runtime exceptions?

A. Runtime exceptions are those exceptions that are thrown at runtime because of either wrong input data or because of wrong business logic etc. These are not checked by the compiler at compile time.

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(#M40029415) JAVA QUESTION java Keep an EYE

Q. What are checked exceptions?

A. Checked exception are those which the Java compiler forces you to catch. e.g. IOException are checked Exceptions

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(#M40029413) JAVA QUESTION java Keep an EYE

Q. What is RMI architecture?

A. RMI architecture consists of four layers and each layer performs specific functions: a) Application layer - contains the actual object definition. b) Proxy layer - consists of stub and skeleton. c) Remote
Reference layer - gets the stream of bytes from the transport layer and sends it to the proxy layer. d) Transportation layer - responsible for handling the actual machine-to-machine communication.

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(#M40029412) JAVA QUESTION java Keep an EYE

Q. What is URL?

A. URL stands for Uniform Resource Locator and it points to resource files on the Internet

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(#M40029405) JAVA QUESTION java Keep an EYE

Q. What is the Java API?

A. The Java API is a large collection of ready-made software components that provide many useful capabilities, such as graphical user interface (GUI) widgets

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(#M40029403) JAVA QUESTION java Keep an EYE

What are drivers available?

a) JDBC-ODBC Bridge driver
b) Native API Partly-Java driver
c) JDBC-Net Pure Java driver
d) Native-Protocol Pure Java driver

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