User defined Exception

      In Java, it is possible to create own exceptions to handle situations specific to an application.

In Java, it is done by defining a subclass of Exception(which is a subclass of Throwable).

     The Exception class does not define any method of its own; it inherits those methods provided by Throwable.

         The methods prov
ided by Throwable are:

 

     Example:

class Exception1 extends Exception

{

privateintval;

Exception1(int s)

 {

val=s;

 }

public String toString()

 {

return "Exception Occurred [ "+val+" ] is not allowed";

 }

}

class Check

{ 

public void generate(intnum) throws Exception1

 {

System.out.println("Inside the function");

if(num<0)

throw new Exception1(num);

System.out.println("Normal Finish");

 }

}

classMyexception

{

public static void main(String args[])

 {

try

  {

    Check t=new Check();

t.generate(10);   

t.generate(-10);

  }

catch(Exception1 e)

  {

System.out.println("Exception occurred inside main:\n"+e);

  }

 }

}

Output:

Inside the function

Normal Finish

Inside the function

Exception occurred inside main:

Exception Occurred [ -10 ] is not allowed