events4

Należy zrobić konwersję do JComponent, bo w tej klasie zdefiniowano metodę ge tCłientPrope rtjif)

class GUI extendsJFrame{

ActionListener colorChanger = new ActionListener() { public void actionPerformec^ActionEvent e) {

JComponent src = (JComponent) egetSource();

Component comp = (Componerjt) src.getClientProperty("ChangeComponent"); String which = (String) src. getClientProp erty(" Cho o s eWhichC olor"); Colorfore = (Color)src. getCli entPr op erty( "F or egr ound");

ge tCłientPrope rtyO zwraca Object Konieczna konwersja do właściwego typu.

C olor back = ( C olor) src. getClientPr op erty( "Backgr ound"); if (comp = nuli) return; if (which !=null) {

Color color =JColorChooser.showDialog(null, which, nuli); if (color = nuli) return; if (which. equals( "For egr ound")) fore = color; else back = color;

}

if(fore !=nuli) comp.setForeground(fore); if(back !=nuU) comp.setBackground(back);

}