MATLAB BUILDER JA 2 Podręcznik Użytkownika Pobierz pdf (Strona 66)

100

101

3 Programming

public Object[] myprimes(int nargout, Object n) throws MWException

{

(implementation omitted)

}

Any method that calls myprimes must do one of two things:

• Catch and handle the

MWException.

• Allow the calling program to catch it.

The following two sections prov ide ex amples of each.

Code Fragment: Handling an Exception in the Called Function

The getprimes example shown here uses the first of these methods. This

method handles the exception itself, and does not need to include a

throws

clause at the start.

public double[] getprimes(int n)

{

myclass cls = null;

Object[] y = null;

try

{

cls = new myclass();

y = cls.myprimes(1, new Double((double)n));

return (double[])((MWArray)y[0]).getData();

}

/* Catches the exception thrown by myprimes */

catch (MWException e)

{

System.out.println("Exception: " + e.toString());

return new double[0];

}

finally

{

MWArray.disposeArray(y);

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