Design Patterns Java™ Workbook

Appendix B. Solutions

public double f(double t)
{
return Math.exp(source[0].f(t));
}
}

SOLUTION 27.4....................................................................................................................................

You might build up the equation by using several Function variables or by defining all in
one shot:

package com.oozinoz.applications;
import com.oozinoz.function.;
public class ShowBrightness
{
public static void main(String args[])
{
FunPanel p = new FunPanel();
p.setPreferredSize(
new java.awt.Dimension(200, 200));
Function brightness =
new Arithmetic(
'',
new Exp(
new Arithmetic(
'', new Constant(-5), new T())),
new Sin(
new Arithmetic(
'',
new Constant(Math.PI),
new T())));

p.setXY(new T(), brightness);
com.oozinoz.ui.SwingFacade.launch(
p,
" Brightness");
}
}

SOLUTION 27.5....................................................................................................................................

Listeners provide flexibility in how an application behaves, but they do not include the idea of
composition. The intent of DECORATOR is to let you compose an object's behavior, not merely
alter it.