overriding ToString()

[MetalR0]

Can someone explain to me how to override the toString(method) in an Exception class? My instructor tried explaining it to me but it kind of went above my head. Sample code below.

public class MetalR0'sException extends Exception {
	public MetalR0'sException(String message) {
		super(message);
	}
	public MetalR0'sException() {
		super("This message should print when exception is thrown");
	}

[sunde887]

Exactly the same as you would override toString in any other class, since an exception is just a class.

[MetalR0]

So I would just add a public String to String method to the above code and set the return String equal to the message I want the error to have? ie

public String toString() {
String s = "This message should print ....."
return s;
}

Right?

[sunde887]

Yup. You could also just do

return "the message";

[MetalR0]

Got it. Thanks!

[sunde887]

I'd like to add that any time you override any method you should use the override annotation. So toString will look like this:

@Override public String toString(){
  return "";
}

This same @Override annotation can be used anywhere and it will allow you to get compile time errors when you improperly override a method, without this method you may just get strange behavior, take the following as an example

public String toStrng(){
  return "";
}

This will compile but when you try printing an object you get something like

Class@152af7

Which is the default toString, with the override annotation, an error will occur signaling your missed i

[Tolls]

Why do you need to override the toString() method?
At least for that example above, the existing one (on Throwable) already supplies the message text.

And that class name is illegal.

[JosAH]

I'd like to add that any time you override any method you should use the override annotation.

I never do that; Eclipse will tell me if the method actually overrides its super implementation ... I trust that ;-)

kind regards,

Jos