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Java Java Objects (Retired) Harnessing the Power of Objects Handling Exceptions

Anthony De Smet
Anthony De Smet
9,666 Points

IllegalArgumentException

I can't find what is wrong, it says that I didn't cath the exception

this is my code:

public class Main { public static void main(String[] args) { GoKart kart = new GoKart("yellow"); if (kart.isBatteryEmpty()) { System.out.println("The battery is empty"); } kart.drive(2); try { kart.drive(100); System.out.println("This will never happen"); } catch (IllegalArgumentException iae){ System.out.println("Whoa there!"); System.out.printf("The error was: %s\n", iae.getMessage()); } } }

Main.java
public class Main {
    public static void main(String[] args) {
        GoKart kart = new GoKart("yellow");
        if (kart.isBatteryEmpty()) {
          System.out.println("The battery is empty");
        }
        kart.drive(2);
       try {
          kart.drive(-20);
         System.out.println("This will never happen");
        } catch (IllegalArgumentException iae){
         System.out.println("Whoa there!"); 
         System.out.printf("The error was: %s\n", iae.getMessage());
        }
    }
}

3 Answers

Marileen Mennerich
Marileen Mennerich
1,161 Points

Your code is pretty much fine. The only problem is that right above your try/catch block, the drive()-method is called. Since this call is outside of the try, the exception is not caught. Remove it or move it into your try block. The drive(-20) call is not necesarry in the latter case.

firstly there is no need to have two drive methods , drive(2) and drive(-20) Secondly, there is no need to write this statement in try, System.out.println("This will never happen");

you may use the code bellow and give me a shout if it helps

public class Main {
    public static void main(String[] args) {
        GoKart kart = new GoKart("yellow");
        if (kart.isBatteryEmpty()) {
          System.out.println("The battery is empty");
        }

      try {
        kart.drive(2);
      } catch (IllegalArgumentException iae) {
       System.out.println("Alert");
           System.out.printf("There was an error: %s\n", iae.getMessage());
        }
    }
}
try {
        dispenser.load(400); 
      } catch (IllegalArgumentException iae) {
        System.out.println("Whoa there!");
        System.out.printf("The error was: %s%n", iae.getMessage());
      }

Above, is the code example to follow. Instead of dispenser.load(400), you are trying kart.drive(2)