SE450: Horstmann Chapter 6: Defining Exception Classes

SE450: Defining Exception Classes [61/65]

Decide exception should be checked
Subclass Exception or RuntimeException

Provide two constructors

public class IllegalFormatException extends Exception
{ 
   public IllegalFormatException() {} 
   public IllegalFormatException(String reason) 
   { super(reason); } 
}

Throw exception when needed:
throw new IllegalFormatException("number expected");