exception

[Oktam]

I'm new to java and got an exception problem...if an exception occurs in my programme i must print the output "can't execute", but with using a new exception: throw new IllegalArgumentException();

Code:

try{
...
..
}
catch(NumberFormatException e) {
	throw new IllegalArgumentException();
}

Where and how do i have to define this IllegalArgumentException so that it can print a certain message??

[CaptainMorgan]

The Sun tutorials show you one way to perform an output upon a thrown exception. There's also another way(as stated in the API for IllegalArgumentException - yes, exceptions have an API page too ) which is not much different from your existing code:

Code:

...
   throw new IllegalArgumentException("Exception: cannot execute.");
...

Pretty easy, right?

[Oktam]

Tnx Capt ...but...it seems i didn't define my problem well enough...here goes.. i'll put a part of my programme here...i made a few classes... one extends the other...

Code:

public class GeometricFigure{

	private String name;
		
	public GeometricFigure(String ime) {
		this.ime = ime;
	}
	
	
	public String getName() {
		return this.name;
	}
	

}

Code:

public class Line extends GeometricFigure {
	
	public Line(int x0, int y0, int x1, int y1) {//coordinates
		super("Line"); 
		this.x0 = x0;
		this.y0 = y0;
		this.x1 = x1;
		this.y1 = y1;
	}
...
..
..	
	public static GeometricFigure fromStringArray(String[] params) throws IllegalArgumentException{
	try{
		 int arg_x0 = Integer.parseInt(params[0]);
		 int arg_y0 = Integer.parseInt(params[1]);
		 int arg_x1 = Integer.parseInt(params[2]);
		 int arg_y1 = Integer.parseInt(params[3]);
		 
		return new Line(arg_x0, arg_y0, arg_x1, arg_y1);
	}
	catch(NumberFormatException e)
	     {
	throw new IllegalArgumentException();
	}
	
	}
}

how can i make the bolded part print "Exception" when i call for example
GeometricFigure figure = Line.fromStringArray(subarray); from some other function from somewhere (one of the elements of subarray is a string).
... how to make it work ... help

EDIT: anyone...?