Java Program to Implement User Defined Exception Handling

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Aim:

To write a java program to implement user defined exception handling

Procedure:

  1. Create a class that extends the Exception class.
  2. Create a constructor which receives the string as an argument.
  3. Get the Amount as input from the user.
  4. If the amount is negative, the exception will be generated.
  5. Using the exception handling mechanism, the thrown exception is handled by the catch construct.
  6. After the exception is handled, the string “invalid amount “ will be displayed.
  7. If the amount is greater than 0, the message “Amount Deposited “ will be displayed

Program 1:

import java.util.Scanner;
 class NegativeAmtException extends Exception
 {
 String msg;
 NegativeAmtException(String msg)
 {
       this.msg=msg;
 }
 public String toString()
 {
        return msg;
 }
}
public class userdefined 
{
 public static void main(String[] args)
{
Scanner s=new Scanner(System.in);
System.out.print("Enter Amount:");
int a=s.nextInt();
try
{
if(a<0)
 {
throw new NegativeAmtException("Invalid Amount");
 }
 System.out.println("Amount Deposited");
 }
catch(NegativeAmtException e)
{
 System.out.println(e);
}
}
}

Output:

Program 2:

class MyException extends Exception{
String str1;
MyException(String str2)
 {
str1=str2;
  }
  public String toString()
 { 
return ("MyException Occurred: "+str1) ;
 }
}
class example
{
 public static void main(String args[])
{
try
{
System.out.println("Starting of try block");
throw new MyException("This is My error Message"); 
}
catch(MyException exp)
{
System.out.println("Catch Block") ;
System.out.println(exp) ;
}
}}

Output:

Result:

Thus a  java program to implement user defined exception handling has been implemented and executed successfully.

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