完整版 Java基础入门教程 Java程序语言设计 全套PPT课件资源 共17个章节 含源代码.rar

import java.awt.*; import java.awt.event.*; class CLXApp extends Frame { Panel mainPanel=null; Choice colorChoice=null; Button okButton=null; Button cancelButton=null; Color colorArray[]={Color.red,Color.blue,Color.green,Color.pink,Color.white,Color.yellow}; public CLXApp(String title) { super(title); } public void Init() { setLayout(new BorderLayout()); mainPanel=new Panel(); add(mainPanel,BorderLayout.CENTER); Panel p=new Panel(); p.setLayout(new GridLayout(1,3)); colorChoice=new Choice(); colorChoice.addItem("Red"); colorChoice.addItem("Blue"); colorChoice.addItem("Green"); colorChoice.addItem("Pink"); colorChoice.addItem("White"); colorChoice.addItem("yellow"); colorChoice.select(4); colorChoice.addItemListener(new ColorItemListener()); okButton=new Button("ok"); okButton.addActionListener(new ColorListener()); cancelButton=new Button("exit"); cancelButton.addActionListener(new ExitListener()); p.add(colorChoice); p.add(okButton); p.add(cancelButton); add(p,BorderLayout.SOUTH); } public static void main(String[] args) { CLXApp app=new CLXApp("AWT App"); app.Init(); app.setSize(300,200); app.setVisible(true); } class ColorItemListener implements ItemListener { public void itemStateChanged(ItemEvent e) { mainPanel.setBackground(colorArray[colorChoice.getSelectedIndex()]); } } class ColorListener implements ActionListener { public void actionPerformed(ActionEvent e) { mainPanel.setBackground(colorArray[colorChoice.getSelectedIndex()]); } } class ExitListener implements ActionListener { public void actionPerformed(ActionEvent e) { System.exit(0); } } }