Vedi la versione AWT.
import java.applet.*; import java.awt.*; import java.awt.event.*; public class CambiaColore2 extends Applet implements ActionListener { private Color[] cCOLORI={ Color.black , Color.blue , Color.cyan , Color.darkGray , Color.gray , Color.green , Color.lightGray, Color.magenta, Color.orange, Color.pink , Color.red , Color.white , Color.yellow }; private String[] sCOLORI={ "Nero" , "Blu" , "Azzurro" , "Grigio scuro" , "Grigio" , "Verde" , "Grigio chiaro", "Magenta" , "Arancione" , "Rosa", "Rosso", "Bianco" , "Giallo" }; private Panel paNORD, paSUD; private Choice colori; private Button cambia, cambia2; private Color sfondo; private Canvas tela; private Label tAlphaf, tAlpha, tAlphaH, tBluef, tBlue, tBlueH, tGreenf, tGreen, tGreenH, tRedf, tRed, tRedH, tRGB, tRGBH, tsRGB, tsRGBH; public void init() { colori=new Choice(); for(int i=0; i < sCOLORI.length; i++) colori.add(sCOLORI[i]); tela=new Canvas(); sfondo=cCOLORI[0]; tela.setBackground(sfondo); cambia =new Button("Cambia"); cambia.addActionListener(this); cambia2=new Button("Bianco"); cambia2.addActionListener(this); paSUD=new Panel(); paSUD.add(new Label("Colore sfondo", Label.RIGHT)); paSUD.add(colori); paSUD.add(cambia); paSUD.add(cambia2); paNORD=new Panel(new GridLayout(6, 4)); tRedf=new Label("", Label.CENTER); paNORD.add(tRedf); tRed =new Label("", Label.CENTER); paNORD.add(tRed); tRedH=new Label("", Label.CENTER); paNORD.add(tRedH); paNORD.add(new Label("RED")); tGreenf=new Label("", Label.CENTER); paNORD.add(tGreenf); tGreen =new Label("", Label.CENTER); paNORD.add(tGreen); tGreenH=new Label("", Label.CENTER); paNORD.add(tGreenH); paNORD.add(new Label("GREEN")); tBluef=new Label("", Label.CENTER); paNORD.add(tBluef); tBlue =new Label("", Label.CENTER); paNORD.add(tBlue); tBlueH=new Label("", Label.CENTER); paNORD.add(tBlueH); paNORD.add(new Label("BLUE")); paNORD.add(new Label()); tRGB =new Label("", Label.CENTER); paNORD.add(tRGB); tRGBH=new Label("", Label.CENTER); paNORD.add(tRGBH); paNORD.add(new Label("RGB")); tAlphaf=new Label("", Label.CENTER); paNORD.add(tAlphaf); tAlpha =new Label("", Label.CENTER); paNORD.add(tAlpha); tAlphaH=new Label("", Label.CENTER); paNORD.add(tAlphaH); paNORD.add(new Label("ALPHA")); paNORD.add(new Label()); tsRGB =new Label("", Label.CENTER); paNORD.add(tsRGB); tsRGBH=new Label("", Label.CENTER); paNORD.add(tsRGBH); paNORD.add(new Label("sRGB")); setta(); this.setLayout(new BorderLayout()); this.add(paNORD, BorderLayout.NORTH); this.add(tela, BorderLayout.CENTER); this.add(paSUD, BorderLayout.SOUTH); } public void actionPerformed(ActionEvent e) { String nome = e.getActionCommand(); if(nome.equals("Cambia")) { int scelta=colori.getSelectedIndex(); sfondo=cCOLORI[scelta]; } else if(nome.equals("Bianco")) sfondo=Color.white; tela.setBackground(sfondo); setta(); } private void setta() { int Alpha=sfondo.getAlpha(); tAlpha.setText("" + Alpha); tAlphaH.setText(Integer.toHexString(Alpha).toUpperCase()); int Blue =sfondo.getBlue(); tBlue.setText("" + Blue); tBlueH.setText(Integer.toHexString(Blue).toUpperCase()); int Green=sfondo.getGreen(); tGreen.setText("" + Green); tGreenH.setText(Integer.toHexString(Green).toUpperCase()); int Red =sfondo.getRed(); tRed.setText("" + Red); tRedH.setText(Integer.toHexString(Red).toUpperCase()); int sRGB =sfondo.getRGB(); tsRGB.setText("" + sRGB); tsRGBH.setText(Integer.toHexString(sRGB).toUpperCase()); int RGB =sRGB & 0x00FFFFFF; tRGB.setText("" + RGB); tRGBH.setText(Integer.toHexString(RGB).toUpperCase()); float[] RGBA=sfondo.getRGBComponents(null); tRedf.setText("" + RGBA[0]); tGreenf.setText("" + RGBA[1]); tBluef.setText("" + RGBA[2]); tAlphaf.setText("" + RGBA[3]); } }