This document discusses exception handling in Java. It defines an exception as an abnormal condition that can occur during program execution. Exception handling is a mechanism for gracefully handling runtime errors. The key benefits of exception handling are that it allows the normal flow of a program to continue after dealing with the error. Try and catch blocks are used to handle exceptions, with code in the try block protected from exceptions that are caught in the catch block. An example shows an ArrayIndexOutOfBoundsException being caught after trying to access an element outside the bounds of an array.

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2. Roll No: CS-1317
BS-Computer Science
4th Semester
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3. Topic:
Exceptional Handling

4.  What is Exception?
 Definition of Exception Handling?
 Why this occur in program?
 Why we use Exception Handling?
 Its Benefits?
 Catching Exceptions.
 Syntax
 Example
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5.  Dictionary Meaning: Exception is an abnormal
condition.
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6.  Exception Handling is a mechanism to handle
runtime errors such as ClassNotFound, IO,
SQL, etc.
 An exception is a problem that arises during
the execution of a program.
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7.  A user has entered invalid data.
 A file that needs to be opened cannot be
found.
 Abnormal termination of program.
 Some exceptions occurs by physical resources
that have failed in some manner (system
dependent events).
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8.  Exception Handling normally use to avoid
disrupts (Break up) the normal flow of the
application that is why we use exception
handling.
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9.  The core advantage of exception handling is
to maintain the normal flow of the
application.
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10.  A method catches an exception using a
combination of the try and catch keywords.
 A try/catch block is placed around the code
that might generate an exception.
 Code within a try/catch block is referred to
as protected code.
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11. 1. try
2. {
3. //Protected code
4. }
5. catch(ExceptionName Object)
6. {
7. //Catch block
8. }
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12. The following is an array is declared with 2
elements. Then the code tries to access the 3rd
element of the array which throws an exception.
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13. 1. import java.io.*;
2. public class ExcepTest{
3. public static void main(String args[]){
4. try{
5. int a[] = new int[2];
6. System.out.println("Access element three :" +
a[3]);
7. }
8. catch(ArrayIndexOutOfBoundsException e)
9. {
10. System.out.println("Exception thrown :" + e);
11. }
12. System.out.println("Out of the block");
13. }
14. }
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14.  http://www.tutorialspoint.com/java/java_exceptions.htm
 http://www.javatpoint.com/exception-handling-in-java
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