Exception: It is nothing but an undesirable or unexpected event that occurs at run time which interrupts the normal flow of the program ’s commands. Exception handling is a mechanism that handle runtime errors like “ClassNotFoundException”, “SQLException”, and so on. An advantage of exception handling is to maintain a flow of the program. An exception can be handled using “try” and “catch” block. Catching exception: Java virtual machine (JVM) searches to handle the error in “catch” clause at that time of exception in the program. So “try-catch” statements are used in order to handle those exceptions. The following are the main keywords used in exception handling. “try” block: Try block contains the block of statements to monitor the exception and it thrown the exception. “catch” block: Catch block catch exception thrown by the try block to handle it. Types of exceptions: There are two types of exceptions. They are: Checked Exception: A class that inherits a “Throwable” class except “RunTimeException” and “Error” are called as checked exceptions. Example: “IOException” Unchecked Exception: A class that inherits a “RunTimeException” class is called as unchecked exceptions. Example: “ArrayIndexOutOfBoundException”

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Chapter 7.4, Problem 20SC

Program Plan Intro

Exception:

It is nothing but an undesirable or unexpected event that occurs at run time which interrupts the normal flow of the program’s commands.

Exception handling is a mechanism that handle runtime errors like “ClassNotFoundException”, “SQLException”, and so on.

An advantage of exception handling is to maintain a flow of the program.

An exception can be handled using “try” and “catch” block.

Catching exception:

Java virtual machine (JVM) searches to handle the error in “catch” clause at that time of exception in the program. So “try-catch” statements are used in order to handle those exceptions. The following are the main keywords used in exception handling.

“try” block: Try block contains the block of statements to monitor the exception and it thrown the exception.

“catch” block: Catch block catch exception thrown by the try block to handle it.

Types of exceptions:

There are two types of exceptions. They are:

Checked Exception:

A class that inherits a “Throwable” class except “RunTimeException” and “Error” are called as checked exceptions.

Example: “IOException”

Unchecked Exception:

A class that inherits a “RunTimeException” class is called as unchecked exceptions.

Example: “ArrayIndexOutOfBoundException”

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