You can also create your own exception sub class simply by extending java Exception class. You can define a constructor for your Exception sub class (not compulsory) and you can override the toString() function to display your customized message on catch.
class InvalidAgeException extends Exception{
InvalidAgeException(String s){
super(s);
}
public String toString()
{
return "Candidate is less than 18 year is not allowed to vote.";
}
}
class ValidateCandidate{
static void validate(int age) throws InvalidAgeException{
if(age < 18)
throw new InvalidAgeException("invalid candidate");
else
System.out.println("welcome to vote");
}
public static void main(String args[]){
try{
validate(13);
}catch(Exception ex){
System.out.println("Exception occured: "+ex);
}
System.out.println("rest of the code...");
}
}
output here:
Points to Remember
- Extend the Exception class to create your own exception class.
- You don’t have to implement anything inside it, no methods are required.
- You can have a Constructor if you want.
- You can override the toString() function, to display customized message.
