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Java interview questions and answers for freshers Page 10

(#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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(#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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(#M40029414) JAVA QUESTION java Keep an EYE

Q. What is a Java Bean?

A. A Java Bean is a software component that has been designed to be reusable in a variety of different environments.

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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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(#M40029411) JAVA QUESTION java Keep an EYE

Q. What is Domain Naming Service(DNS)?

A. It is very difficult to remember a set of numbers(IP address) to connect to the Internet. The Domain Naming Service(DNS) is used to overcome this problem. It maps one particular IP address to a string of characters. For example, www. mascom. com implies com is the domain name reserved for US commercial sites, moscom is the name of the company and www is the name of the specific computer, which is mascom's server

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(#M40029410) JAVA QUESTION java Keep an EYE

Q. What is the difference between this() and super()?

A. This() can be used to invoke a constructor of the same class whereas super() can be used to invoke a super class constructor.

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(#M40029409) JAVA QUESTION java Keep an EYE

Q. What is method overloading and method overriding?

A. Method overloading: When a method in a class having the same method name with different arguments is said to be method overloading. Method overriding : When a method in a class having the same method name with same arguments is said to be method overriding.

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(#M40029408) JAVA QUESTION java Keep an EYE

Q. What is the use of bin and lib in JDK?

A. Bin contains all tools such as javac, appletviewer, awt tool, etc., whereas lib contains API and all
packages

Solution

Ans:-Bin contains all tools such as javac, appletviewer, awt tool, etc., whereas lib contains API and all
packages


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