Question

why should we program for exceptions?

Using code snippets, provide an example situation where programming for exceptions gives value to the end user.

Answer 1

Answer:) Exception is an event that disrupts the normal flow of the program. It is an object which is thrown at runtime. The exception handling in java is one of the powerful mechanism to handle the runtime errors so that normal flow of the application can be maintained. The core advantage of exception handling is to maintain the normal flow of the application. Exception normally disrupts the normal flow of the application that is why we use exception handling An exception (or exceptional event) is a problem that arises during the execution of a program. When an Exception occurs the normal flow of the program is disrupted and the program/Application terminates abnormally, which is not recommended, therefore, these exceptions are to be handled. Types of Exception There are mainly two types of exceptions: checked and unchecked where error is considered as unchecked exception. The sun microsystem says there are three types of exceptions: 1. Checked Exception 2. Unchecked Exception 3. Error

class ExceptionThrown
{
// It throws the Exception(ArithmeticException).
// Appropriate Exception handler is not found within this method.
static int divideByZero(int a, int b){

// this statement will cause ArithmeticException(/ by zero)
int i = a/b;

return i;
}

// The runTime System searches the appropriate Exception handler
// in this method also but couldn't have found. So looking forward
// on the call stack.
static int computeDivision(int a, int b) {

int res =0;

try
{
res = divideByZero(a,b);
}
// doesn't matches with ArithmeticException
catch(NumberFormatException ex)
{
System.out.println("NumberFormatException is occured");
}
return res;
}

// In this method found appropriate Exception handler.
// i.e. matching catch block.
public static void main(String args[]){

int a = 1;
int b = 0;

try
{
int i = computeDivision(a,b);

}

// matching ArithmeticException
catch(ArithmeticException ex)
{
// getMessage will print description of exception(here / by zero)
System.out.println(ex.getMessage());
}
}
}

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