IllegalArgumentException

packageorg.training.exceptions;

public class IllegalArgument {

      public static void main(String[] args) {

           

            IllegalArgument ia = new IllegalArgument();

            try {

                  ia.simpleMethod("Hello");

                  ia.simpleMethod(null);

            }catch(IllegalArgumentException iae) {

                  System.err.println("Illegal Argument Exception has been caught, check your arguments again");

                  iae.printStackTrace();

            }

      }

     

      public voidsimpleMethod(String argument) {

            if(argument == null) {

                  throw newIllegalArgumentException();

            }else

                  System.out.println(argument);

      }

}

Output:

Hello

Illegal Argument Exception has been caught, check your arguments again

java.lang.IllegalArgumentException

      at org.training.exceptions.IllegalArgument.simpleMethod(IllegalArgument.java:19)

      at org.training.exceptions.IllegalArgument.main(IllegalArgument.java:10)