Java The Complete Reference, Seventh Edition

public void init() {

setLayout(new BorderLayout());

Panel p = new Panel();

add(p, BorderLayout.SOUTH);

reset = new Button("Reset");

reset.addActionListener(this);

p.add(reset);

StringTokenizer st = new StringTokenizer(getParameter("filters"), "+");

while(st.hasMoreTokens()) {

Button b = new Button(st.nextToken());

b.addActionListener(this);

p.add(b);

}

lab = new Label("");

add(lab, BorderLayout.NORTH);

img = getImage(getDocumentBase(), getParameter("img"));

lim = new LoadedImage(img);

add(lim, BorderLayout.CENTER);

}

public void actionPerformed(ActionEvent ae) {

String a = "";

try {
a = ae.getActionCommand();
if (a.equals("Reset")) {
lim.set(img);
lab.setText("Normal");
}
else {
pif = (PlugInFilter) Class.forName(a).newInstance();
fimg = pif.filter(this, img);
lim.set(fimg);
lab.setText("Filtered: " + a);
}
repaint();
} catch (ClassNotFoundException e) {
lab.setText(a + " not found");
lim.set(img);
repaint();
} catch (InstantiationException e) {
lab.setText("couldn't new " + a);
} catch (IllegalAccessException e) {
lab.setText("no access: " + a);
}
}
}

Figure 25-7 shows what the applet looks like when it is first loaded using the applet tag
shown at the top of this source file.

Chapter 25: Images 773