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<SCRIPT LANGUAGE="JavaScript" SRC="/-fs0/sys/pop-up.js"></SCRIPT><SCRIPT LANGUAGE="JavaScript" SRC="/-fs0/sys/pop-up-all.js"></SCRIPT><html><head><title>易都网--Java 2 图形设计卷Ⅱ：SWING</title><LINK rel="stylesheet" href="../../../_public/javaa.css"><meta http-equiv="Content-Type" content="text/html; charset=GBK"><script language="JavaScript" src="../../../_public/javaa.js"></script><meta name="keywords" content="Java,JSP,ASP,PHP,J2EE,EJB,JavaScript,C/C++,ASM,CSS,HTML,XML,网络安全,MySQL,ACCESS"></head><body bgcolor="#FFFFFF"><table border=0 cellpadding=0 cellspacing=0 width="100%"> <tbody> <script language="javascript">print2()</script> <tr> <td width="100%"> <table bgcolor=#EEEEEE border=0 cellpadding=3 cellspacing=0 width="100%"> <tbody> <tr> <td class=f1 id=thetd width="100%"> <p>[<a href="index.html" target="_self">目录</a>][<a href="s08.htm">上一页</a>][<a href="s10.htm">下一页</a>]</p> <p align="center"><b>第9章 反转按钮、复选框和单选框</b></p> <p> 本章介绍三种Swing按钮：反转按钮、复选按钮和单选按钮，它们分别由JToggleButton、JCheckBox和JRadioButton类代表。<br> 这三种按钮都是AbstractButton类的最终扩展。AbstractButton类实现了这三个类提供的几乎所有功能。有关AbstractButton类的更多信息，请参见第8章“标签与按钮”。 </p> <p> <b>9.1 JToggleButton类</b></p> <p> </p> <p align="center"><b>例9-1 JToggleButton的一个简单例子</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*; <p>public class Test extends JApplet {<br> public Test() {<br> Container contentPane = getContentPane();<br> ImageIcon icon = new ImageIcon("togglebuttonImage.gif");</p> <p> JToggleButton button = new JToggleButton(icon);<br> contentPane.setLayout(new FlowLayout());<br> contentPane.add(button);<br> }<br> }</p> <hr size="1" noshade> <p> 9.1.1 JToggleButton属性 </p> <p> </p> <p> 9.1.2 JToggleButton事件</p> <p> </p> <p align="center"><b>例9-2 用一个子项监听器来处理反转按钮的选取操作</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*;<br> import javax.swing.event.*; <p>public class Test extends JApplet {<br> public Test() {<br> Container contentPane = getContentPane();<br> ImageIcon icon = new ImageIcon("togglebuttonImage.gif");<br> final JToggleButton button = new JToggleButton(icon);</p> <p> contentPane.setLayout(new FlowLayout());<br> contentPane.add(button);</p> <p> button.addItemListener(new ItemListener() {<br> public void itemStateChanged(ItemEvent e) {<br> int state = e.getStateChange();<br> String s;</p> <p> if(state == ItemEvent.SELECTED) s = "selected";<br> else s = "deselected";</p> <p> showStatus("Item Event: " + s);<br> }<br> });<br> }<br> }</p> <hr size="1" noshade> <p> 9.1.3 JToggleButton类总结</p> <p> </p> <p align="center"><b>例9-3 创建反转按钮</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*; <p>public class Test extends JApplet {<br> public Test() {<br> Container contentPane = getContentPane();<br> Icon icon = new ImageIcon("beach_umbrella.gif");<br> JToggleButton button_1 = new JToggleButton(),<br> button_2 = new JToggleButton(icon),<br> button_3 = new JToggleButton(icon, true),<br> button_4 = new JToggleButton("beach"),<br> button_5 = new JToggleButton("beach",true),<br> button_6 = new JToggleButton("beach",icon),<br> button_7 = new JToggleButton("beach",icon,<br> true);<br> contentPane.setLayout(new FlowLayout());<br> contentPane.add(button_1);<br> contentPane.add(button_2);<br> contentPane.add(button_3);<br> contentPane.add(button_4);<br> contentPane.add(button_5);<br> contentPane.add(button_6);<br> contentPane.add(button_7);<br> }<br> }</p> <hr size="1" noshade> <p> 9.1.4 AWT兼容</p> <p> </p> <p> 9.2 按钮框</p> <p> </p> <p align="center"><b>例9-4 为相互排斥的选取行为使用一个按钮组</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*; <p>public class Test extends JApplet {<br> public Test() {<br> Container contentPane = getContentPane();<br> ButtonGroup group = new ButtonGroup();</p> <p> JToggleButton[] buttons = new JToggleButton[] {<br> new JToggleButton(new ImageIcon("ballot_box.gif")),<br> new JToggleButton(new ImageIcon("palette.gif")),<br> new JToggleButton(new ImageIcon("light_bulb1.gif")),<br> new JToggleButton(new ImageIcon("dining.gif")),<br> new JToggleButton(new ImageIcon("scissors.gif")),<br> new JToggleButton(new ImageIcon("tricycle.gif")),<br> };<br> Box box = Box.createVerticalBox();<br> <br> for(int i=0; i < buttons.length; ++i) {<br> group.add(buttons[i]);<br> box.add(Box.createVerticalStrut(5));<br> box.add(buttons[i]);<br> }<br> box.add(Box.createVerticalStrut(5));<br> contentPane.add(box);<br> }<br> }</p> <hr size="1" noshade> <p> 9.3 复选框</p> <p> </p> <p align="center"><b>例9-5 运行中的Swing复选框</b></p> <hr noshade size="1"> import javax.swing.*; <br> import java.awt.*;<br> import java.awt.event.*; <p>public class Test extends JApplet {<br> public void init() {<br> Container contentPane = getContentPane();<br> contentPane.add(new PrintOptionsPanel(this), "Center");<br> }<br> }<br> class PrintOptionsPanel extends JPanel {<br> JCheckBox oddPages, evenPages, collate, lastFirst;<br> Listener listener = new Listener();<br> JApplet applet;</p> <p> public PrintOptionsPanel(JApplet applet) {<br> this.applet = applet;<br> oddPages = new JCheckBox("Odd Pages");<br> evenPages = new JCheckBox("Even Pages");<br> collate = new JCheckBox("Collate");<br> lastFirst = new JCheckBox("Last Page First");</p> <p> oddPages.addItemListener (listener);<br> evenPages.addItemListener(listener);<br> collate.addItemListener (listener);<br> lastFirst.addItemListener(listener);</p> <p> add(oddPages); <br> add(evenPages);<br> add(collate); <br> add(lastFirst);<br> }<br> class Listener implements ItemListener {<br> public void itemStateChanged(ItemEvent event) {<br> applet.showStatus(<br> "Odd Pages: " + oddPages.isSelected() + ", " +<br> "Even Pages: " + evenPages.isSelected() + ", " +<br> "Collate: " + collate.isSelected() + ", " +<br> "Last Page First: " + lastFirst.isSelected());<br> }<br> }<br> }</p> <hr size="1" noshade> <p> 9.3.1 JCheckBox属性</p> <p> </p> <p> 9.3.2 JCheckBox事件</p> <p> </p> <p> 9.3.3 JCheckBox类总结</p> <p> </p> <p align="center"><b>例9-6 实例化复选框</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*; <p>public class Test extends JApplet {<br> public Test() {<br> Container contentPane = getContentPane();<br> Icon icon = new ImageIcon("bulb.gif");<br> JCheckBox[] checkboxes = new JCheckBox[] {<br> new JCheckBox(),<br> new JCheckBox(icon),<br> new JCheckBox(icon, true),<br> new JCheckBox("idea!"),<br> new JCheckBox("idea!",true),<br> new JCheckBox("idea!",icon),<br> new JCheckBox("idea!",icon, true)<br> };<br> contentPane.setLayout(new FlowLayout());</p> <p> for(int i=0; i < checkboxes.length; ++i) {<br> checkboxes[i].setBorderPainted(true);<br> contentPane.add(checkboxes[i]);</p> <p> if(checkboxes[i].getIcon() != null) {<br> System.out.println("setting selected icon");<br> checkboxes[i].setSelectedIcon(<br> new ImageIcon("bulb_bright.gif"));<br> }<br> }<br> }<br> }</p> <hr size="1" noshade> <p> 9.4 单选钮</p> <p> </p> <p align="center"><b>例9-7 运行中的单选钮</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*; <p>public class Test extends JApplet {<br> public void init() {<br> Container contentPane = getContentPane();</p> <p> contentPane.add(new PrintRangePanel(100, 101));<br> }<br> }<br> class PrintRangePanel extends JPanel {<br> JRadioButton printAll, printRange;<br> JLabel startPage, endPage;<br> JTextField startField, endField;</p> <p> public PrintRangePanel(int start, int end) {<br> ButtonGroup group= new ButtonGroup();</p> <p> printAll = new JRadioButton("Print All");<br> printRange = new JRadioButton("Print Range");</p> <p> startPage = new JLabel("Start Page:");<br> endPage = new JLabel("End Page:");</p> <p> startField = new JTextField(Integer.toString(start));<br> endField = new JTextField(Integer.toString(end));</p> <p> add(printAll); add(printRange);<br> add(startPage); add(startField);<br> add(endPage); add(endField);</p> <p> printRange.setSelected(true);</p> <p> group.add(printAll);<br> group.add(printRange);</p> <p> printRange.addItemListener(new ItemListener() {<br> public void itemStateChanged(ItemEvent event) {<br> if(printRange.isSelected()) {<br> startField.setEnabled(true);<br> endField.setEnabled (true); <br> startPage.setEnabled (true); <br> endPage.setEnabled (true); </p> <p> //startPage.repaint();<br> //endPage.repaint();</p> <p> startField.requestFocus();<br> }<br> }<br> });<br> printAll.addItemListener(new ItemListener() {<br> public void itemStateChanged(ItemEvent event) {<br> if(printAll.isSelected()) {<br> startField.setEnabled(false);<br> endField.setEnabled (false);<br> startPage.setEnabled (false);<br> endPage.setEnabled (false);</p> <p> startPage.repaint();<br> endPage.repaint();<br> }<br> }<br> });<br> }<br> }</p> <hr size="1" noshade> <p> 9.4.1 JRadioButton属性</p> <p> </p> <p> 9.4.2 JRadioButton事件</p> <p> </p> <p> 9.4.3 JRadioButton类总结</p> <p> </p> <p align="center"><b>例9-8 实例化单选按钮</b></p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*; <p>public class Test extends JApplet {<br> public Test() {<br> Container contentPane = getContentPane();<br> Icon icon = new ImageIcon("bulb.gif");<br> JRadioButton[] radioButtons = new JRadioButton[] {<br> new JRadioButton(),<br> new JRadioButton(icon),<br> new JRadioButton(icon, true),<br> new JRadioButton("idea!"),<br> new JRadioButton("idea!",true),<br> new JRadioButton("idea!",icon),<br> new JRadioButton("idea!",icon, true)<br> };<br> contentPane.setLayout(new FlowLayout());</p> <p> for(int i=0; i < radioButtons.length; ++i) {<br> radioButtons[i].setBorderPainted(true);<br> contentPane.add(radioButtons[i]);</p> <p> if(radioButtons[i].getIcon() != null) {<br> System.out.println("setting selected icon");<br> radioButtons[i].setSelectedIcon(<br> new ImageIcon("bulb_bright.gif"));<br> }<br> }<br> }<br> }</p> <hr size="1" noshade> <p> 9.4.4 AWT兼容</p> <p> </p> <p> 9.5 本章回顾</p> <p> </p> <p> [<a href="index.html" target="_self">目录</a>][<a href="s08.htm">上一页</a>][<a href="s10.htm">下一页</a>](飒龙收藏/2002.5.18) </p> </td> </tr> </tbody> </table> </td> </tr></tbody></table><script language="javascript">bottomprint()</script></body></html>⌨️ 快捷键说明
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