100个Java经典例子（11-20）

package test11; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.AbstractButton; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; /** * Title: 按钮演示 * Description: 提供一个按钮的演示。如何实现按钮和是一个按钮失效 * Filename: */ public class ButtonDemo extends JPanel implements ActionListener { private static final long serialVersionUID = 1L; protected JButton b1, b2, b3; /** *方法说明：构造器，初始图形界面构建 */ public ButtonDemo() { ImageIcon leftButtonIcon = createImageIcon("images/right.gif"); ImageIcon middleButtonIcon = createImageIcon("images/middle.gif"); ImageIcon rightButtonIcon = createImageIcon("images/left.gif"); b1 = new JButton("失效中间按钮(D)", leftButtonIcon); b1.setVerticalTextPosition(AbstractButton.CENTER);//水平中间对齐 b1.setHorizontalTextPosition(AbstractButton.LEADING);//相当于LEFT b1.setMnemonic(KeyEvent.VK_D);//将b1邦定alt+D键 b1.setActionCommand("disable"); b2 = new JButton("M中间按钮", middleButtonIcon); b2.setVerticalTextPosition(AbstractButton.BOTTOM); b2.setHorizontalTextPosition(AbstractButton.CENTER); b2.setMnemonic(KeyEvent.VK_M);//将b2邦定alt+M键 b3 = new JButton("E激活中间按钮", rightButtonIcon); b3.setMnemonic(KeyEvent.VK_E);//将b3邦定alt+E键 b3.setActionCommand("enable"); b3.setEnabled(false); //给1和3添加事件监听 b1.addActionListener(this); b3.addActionListener(this); //设置按钮提示文本 b1.setToolTipText("点击这个按钮，将使中间的按钮失效！"); b2.setToolTipText("点击这个按钮，没有任何的事件发生！"); b3.setToolTipText("点击这个按钮，将使中间的按钮有效"); //将按钮添加到JPanel中 add(b1); add(b2); add(b3); } /** *方法说明：事件处理 */ public void actionPerformed(ActionEvent e) { if ("disable".equals(e.getActionCommand())) { b2.setEnabled(false); b1.setEnabled(false); b3.setEnabled(true); } else { b2.setEnabled(true); b1.setEnabled(true); b3.setEnabled(false); } } /** *方法说明：创建图标， *输入参数：String path 图标所在的路径 *返回类型：ImageIcon 图标对象 */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = ButtonDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** *方法说明：主方法 */ public static void main(String[] args) { //设置使用新的swing界面 JFrame.setDefaultLookAndFeelDecorated(true); //创建一个窗体 JFrame frame = new JFrame("ButtonDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建一个面板 ButtonDemo newContentPane = new ButtonDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } } package test12; import java.awt.*; import java.awt.event.*; import javax.swing.*; /** * Title: 检查盒演示 * Description: 选择不同的选择框显示不同的图片 * Filename: CheckBoxDemo.java< */ public class CheckBoxDemo extends JPanel implements ItemListener { private static final long serialVersionUID = 1L; JCheckBox chinButton; JCheckBox glassesButton; JCheckBox hairButton; JCheckBox teethButton; /* * 有四个检查盒，分别对应下巴、眼镜、头发和牙齿 * 图片不是拼出来的，而是根据检查盒选择拼写图片文件名 * 图片文件名的定义格式为"geek-XXXX.gif" * 其中 XXXX 根据检查盒的不同选择，而不同。它的格式如下： ---- //没有选择 c--- //一个选择 -g-- --h- ---t cg-- //两个选择 c-h- c--t -gh- -g-t --ht -ght //三个选择 c-ht cg-t cgh- cght //所有都选 */ StringBuffer choices; JLabel pictureLabel; public CheckBoxDemo() { super(new BorderLayout()); //创建检查盒 chinButton = new JCheckBox("下巴(c)"); chinButton.setMnemonic(KeyEvent.VK_C); chinButton.setSelected(true); glassesButton = new JCheckBox("眼镜(g)"); glassesButton.setMnemonic(KeyEvent.VK_G); glassesButton.setSelected(true); hairButton = new JCheckBox("头发(h)"); hairButton.setMnemonic(KeyEvent.VK_H); hairButton.setSelected(true); teethButton = new JCheckBox("牙齿(t)"); teethButton.setMnemonic(KeyEvent.VK_T); teethButton.setSelected(true); //给检查盒添加监听 chinButton.addItemListener(this); glassesButton.addItemListener(this); hairButton.addItemListener(this); teethButton.addItemListener(this); choices = new StringBuffer("cght"); //放置一个带图片的标签 pictureLabel = new JLabel(); pictureLabel.setFont(pictureLabel.getFont().deriveFont(Font.ITALIC)); updatePicture(); //将检查盒放置到面版中 JPanel checkPanel = new JPanel(new GridLayout(0, 1)); checkPanel.add(chinButton); checkPanel.add(glassesButton); checkPanel.add(hairButton); checkPanel.add(teethButton); add(checkPanel, BorderLayout.LINE_START); add(pictureLabel, BorderLayout.CENTER); setBorder(BorderFactory.createEmptyBorder(20,20,20,20)); } /** *
方法说明：监听检查盒事件，拼凑图片的文件名XXXX部分 *
输入参数： *
返回类型： */ public void itemStateChanged(ItemEvent e) { int index = 0; char c = '-'; Object source = e.getItemSelectable(); if (source == chinButton) { index = 0; c = 'c'; } else if (source == glassesButton) { index = 1; c = 'g'; } else if (source == hairButton) { index = 2; c = 'h'; } else if (source == teethButton) { index = 3; c = 't'; } //取消选择事件 if (e.getStateChange() == ItemEvent.DESELECTED) { c = '-'; } //改变文件名字XXXX choices.setCharAt(index, c); updatePicture(); } /** *
方法说明：绘制图片 *
输入参数： *
返回类型： */ protected void updatePicture() { //将得到的图片制成图标 ImageIcon icon = createImageIcon( "images/geek/geek-" + choices.toString() + ".gif"); pictureLabel.setIcon(icon); pictureLabel.setToolTipText(choices.toString()); if (icon == null) { pictureLabel.setText("没有发现图片"); } else { pictureLabel.setText(null); } } /** *
方法说明：获取图标 *
输入参数：String path 图片路径 *
返回类型：ImageIcon对象 */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = CheckBoxDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** *
方法说明：主方法 *
输入参数： *
返回类型： */ public static void main(String s[]) { JFrame.setDefaultLookAndFeelDecorated(true); //创建一个窗体， JFrame frame = new JFrame("CheckBoxDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建一个面板 JComponent newContentPane = new CheckBoxDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } }
package test13; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; import java.text.SimpleDateFormat; /** * Title: ComboBox下拉域演示

* Description: 通过选择或这输入一种日期格式来格式化今天的日期 * Filename: ComboBoxDemo.java */ public class ComboBoxDemo extends JPanel implements ActionListener { private static final long serialVersionUID = 1L; static JFrame frame; JLabel result; String currentPattern; /** *方法说明：构造器。初始化窗体构件 */ public ComboBoxDemo() { setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS)); String[] patternExamples = { "dd MMMMM yyyy", "dd.MM.yy", "MM/dd/yy", "yyyy.MM.dd G 'at' hh:mm:ss z", "EEE, MMM d, ''yy", "h:mm a", "H:mm:ss:SSS", "K:mm a,z", "yyyy.MMMMM.dd GGG hh:mm aaa" }; currentPattern = patternExamples[0]; //设置一个规范的用户界面 JLabel patternLabel1 = new JLabel("输入一个字符格式或者"); JLabel patternLabel2 = new JLabel("从下拉列表中选择一种："); JComboBox patternList = new JComboBox(patternExamples); patternList.setEditable(true);//标注这里ComboBox可进行编辑 patternList.addActionListener(this); //创建一个显示结果用户界面 JLabel resultLabel = new JLabel("当前 日期/时间", JLabel.LEADING);//相当于LEFT result = new JLabel(" "); result.setForeground(Color.black); result.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createLineBorder(Color.black), BorderFactory.createEmptyBorder(5,5,5,5) )); //布置构件 JPanel patternPanel = new JPanel(); patternPanel.setLayout(new BoxLayout(patternPanel, BoxLayout.PAGE_AXIS)); patternPanel.add(patternLabel1); patternPanel.add(patternLabel2); patternList.setAlignmentX(Component.LEFT_ALIGNMENT); patternPanel.add(patternList); JPanel resultPanel = new JPanel(new GridLayout(0, 1)); resultPanel.add(resultLabel); resultPanel.add(result); patternPanel.setAlignmentX(Component.LEFT_ALIGNMENT); resultPanel.setAlignmentX(Component.LEFT_ALIGNMENT); add(patternPanel); add(Box.createRigidArea(new Dimension(0, 10))); add(resultPanel); setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); reformat(); } /** *方法说明：事件处理 */ public void actionPerformed(ActionEvent e) { JComboBox cb = (JComboBox)e.getSource(); String newSelection = (String)cb.getSelectedItem(); currentPattern = newSelection; reformat(); } /** *方法说明：格式和显示今天的日期 */ public void reformat() { Date today = new Date(); SimpleDateFormat formatter = new SimpleDateFormat(currentPattern); try { String dateString = formatter.format(today); result.setForeground(Color.black); result.setText(dateString); } catch (IllegalArgumentException iae) { result.setForeground(Color.red); result.setText("Error: " + iae.getMessage()); } } /** *方法说明：主方法 */ public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); //创建一个窗体 frame = new JFrame("ComboBoxDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建一个面版容器 JComponent newContentPane = new ComboBoxDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } }
package test14; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; /** * Title: 列表框 * Description: 通过输入框添加元素和点击“删除”按钮删除列表元素 * Filename: ListDemo.java */ public class ListDemo extends JPanel implements ListSelectionListener { private static final long serialVersionUID = 1L; private JList list; private DefaultListModel listModel; private static final String hireString = "添加"; private static final String fireString = "删除"; private JButton fireButton; private JTextField employeeName; public ListDemo() { super(new BorderLayout()); //构建List的列表元素 listModel = new DefaultListModel(); listModel.addElement("Alan Sommerer"); listModel.addElement("Alison Huml"); listModel.addElement("Kathy Walrath"); listModel.addElement("Lisa Friendly"); listModel.addElement("Mary Campione"); listModel.addElement("Sharon Zakhour"); //创建一个List构件,并将列表元素添加到列表中 list = new JList(listModel); //设置选择模式为单选 list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); //初始化选择索引在0的位置，即第一个元素 list.setSelectedIndex(0); list.addListSelectionListener(this); //设置列表可以同时看5个元素 list.setVisibleRowCount(5); //给列表添加一个滑动块 JScrollPane listScrollPane = new JScrollPane(list); JButton hireButton = new JButton(hireString); HireListener hireListener = new HireListener(hireButton); hireButton.setActionCommand(hireString); hireButton.addActionListener(hireListener); hireButton.setEnabled(false); fireButton = new JButton(fireString); fireButton.setActionCommand(fireString); fireButton.addActionListener(new FireListener()); employeeName = new JTextField(10); employeeName.addActionListener(hireListener); employeeName.getDocument().addDocumentListener(hireListener); @SuppressWarnings("unused") String name = listModel.getElementAt( list.getSelectedIndex()).toString(); //创建一个面板 JPanel buttonPane = new JPanel(); buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.LINE_AXIS)); buttonPane.add(fireButton); buttonPane.add(Box.createHorizontalStrut(5)); buttonPane.add(new JSeparator(SwingConstants.VERTICAL)); buttonPane.add(Box.createHorizontalStrut(5)); buttonPane.add(employeeName); buttonPane.add(hireButton); buttonPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); add(listScrollPane, BorderLayout.CENTER); add(buttonPane, BorderLayout.PAGE_END); } /** *类说明：“添加”按钮监听 *类描述：当点击“添加”按钮后，实现将元素添加到列表框中 */ class FireListener implements ActionListener { public void actionPerformed(ActionEvent e) { int index = list.getSelectedIndex(); listModel.remove(index); int size = listModel.getSize(); if (size == 0) { //如果没有了选择项，则是“删除”按钮实效 fireButton.setEnabled(false); } else { //选择了一个 if (index == listModel.getSize()) { //移除选项 index--; } list.setSelectedIndex(index); list.ensureIndexIsVisible(index); } } } /** *类说明：“删除”按钮监听事件 *类描述：实现删除列表元素 */ class HireListener implements ActionListener, DocumentListener { private boolean alreadyEnabled = false; private JButton button; public HireListener(JButton button) { this.button = button; } //必须实现 ActionListener. public void actionPerformed(ActionEvent e) { String name = employeeName.getText(); //如果输入空或有同名 if (name.equals("") || alreadyInList(name)) { Toolkit.getDefaultToolkit().beep(); employeeName.requestFocusInWindow(); employeeName.selectAll(); return; } int index = list.getSelectedIndex(); //获取选择项 if (index == -1) { //如果没有选择，就插入到第一个 index = 0; } else { //如果有选择，那么插入到选择项的后面 index++; } listModel.insertElementAt(employeeName.getText(), index); //重新设置文本 employeeName.requestFocusInWindow(); employeeName.setText(""); //选择新的元素，并显示出来 list.setSelectedIndex(index); list.ensureIndexIsVisible(index); } /** *方法说明：检测是否在LIST中有重名元素 *输入参数：String name 检测的名字 *返回类型：boolean 布尔值，如果存在返回true */ protected boolean alreadyInList(String name) { return listModel.contains(name); } /** *方法说明：实现DocumentListener接口，必需实现的方法： */ public void insertUpdate(DocumentEvent e) { enableButton(); } /** *方法说明：实现DocumentListener接口，必需实现的方法 */ public void removeUpdate(DocumentEvent e) { handleEmptyTextField(e); } /** *方法说明：实现DocumentListener接口，必需实现的方法 */ public void changedUpdate(DocumentEvent e) { if (!handleEmptyTextField(e)) { enableButton(); } } /** *方法说明：按钮使能 */ private void enableButton() { if (!alreadyEnabled) { button.setEnabled(true); } } /** *方法说明：实现DocumentListener接口，必需实现的方法，修改按钮的状态 */ private boolean handleEmptyTextField(DocumentEvent e) { if (e.getDocument().getLength() <= 0) { button.setEnabled(false); alreadyEnabled = false; return true; } return false; } } /** *方法说明：实现ListSelectionListener接口，必需实现的方法： */ public void valueChanged(ListSelectionEvent e) { if (e.getValueIsAdjusting() == false) { if (list.getSelectedIndex() == -1) { fireButton.setEnabled(false); } else { fireButton.setEnabled(true); } } } /** *方法说明：主方法 */ public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); //创建一个窗体 JFrame frame = new JFrame("ListDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建一个面版 JComponent newContentPane = new ListDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } }
package test15; import javax.swing.JTabbedPane; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JFrame; /** * Title: 选项卡演示 * Description: 这里是一个选项卡演示，点击不同的卡片，显示的内容不同 * Filename: TabbedPaneDemo.java */ import java.awt.*; public class TabbedPaneDemo extends JPanel { /** * */ private static final long serialVersionUID = 1L; public TabbedPaneDemo() { super(new GridLayout(1, 1)); ImageIcon icon = createImageIcon("images/middle.gif"); JTabbedPane tabbedPane = new JTabbedPane(); Component panel1 = makeTextPanel("#第一个卡片#"); tabbedPane.addTab("One", icon, panel1, "第一个卡片提示信息！"); tabbedPane.setSelectedIndex(0); Component panel2 = makeTextPanel("##第二个卡片##"); tabbedPane.addTab("Two", icon, panel2, "第二个卡片提示信息！"); Component panel3 = makeTextPanel("###第三个卡片###"); tabbedPane.addTab("Three", icon, panel3, "第三个卡片提示信息！"); Component panel4 = makeTextPanel("####第四个卡片####"); tabbedPane.addTab("Four", icon, panel4, "第四个卡片提示信息！"); //将选项卡添加到panl中 add(tabbedPane); } /** *方法说明：添加信息到选项卡中 *输入参数：String text 显示的信息内容 *返回类型：Component 成员对象 */ protected Component makeTextPanel(String text) { JPanel panel = new JPanel(false); JLabel filler = new JLabel(text); filler.setHorizontalAlignment(JLabel.CENTER); panel.setLayout(new GridLayout(1, 1)); panel.add(filler); return panel; } /** *方法说明：获得图片 *输入参数：String path 图片的路径 *返回类型：ImageIcon 图片对象 */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = TabbedPaneDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } public static void main(String[] args) { //使用Swing窗体描述 JFrame.setDefaultLookAndFeelDecorated(true); //创建窗体 JFrame frame = new JFrame("TabbedPaneDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(new TabbedPaneDemo(), BorderLayout.CENTER); //显示窗体 frame.setSize(400, 200); frame.setVisible(true); } }
package test16; import javax.swing.JOptionPane; import javax.swing.JDialog; import javax.swing.JTextField; import java.beans.*; //property change stuff import java.awt.*; import java.awt.event.*; /** * Title: 用户自定义对话框 * Description: 自己定义对话框的风格。这使得对话框的样式更加多样化 * Filename: CustomDialog.java */ class CustomDialog extends JDialog implements ActionListener, PropertyChangeListener { private static final long serialVersionUID = 1L; private String typedText = null; private JTextField textField; private DialogDemo dd; private String magicWord; private JOptionPane optionPane; private String btnString1 = "确定"; private String btnString2 = "取消"; /** *方法说明：返回文本输入字符 */ public String getValidatedText() { return typedText; } /** *方法说明：创建一个结果对话框 */ public CustomDialog(Frame aFrame, String aWord, DialogDemo parent) { super(aFrame, true); dd = parent; magicWord = aWord.toUpperCase(); setTitle("测试"); textField = new JTextField(10); //定义显示信息 String msgString1 = "李先生： jeck是你的英文名字吗？"; String msgString2 = "(这个答案是： \"" + magicWord + "\"。)"; Object[] array = {msgString1, msgString2, textField}; Object[] options = {btnString1, btnString2}; //创建对话框 optionPane = new JOptionPane(array, JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION, null, options, options[0]); //显示对话框 setContentPane(optionPane); //设置当关闭窗体动作模式 setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { optionPane.setValue(new Integer( JOptionPane.CLOSED_OPTION)); } }); //使的文本输入域得到焦点 addComponentListener(new ComponentAdapter() { public void componentShown(ComponentEvent ce) { textField.requestFocusInWindow(); } }); //给文本域添加监听事件 textField.addActionListener(this); //监听输入改变 optionPane.addPropertyChangeListener(this); } /** 文本域监听处理 */ public void actionPerformed(ActionEvent e) { optionPane.setValue(btnString1); } /** 监听输入的改变 */ public void propertyChange(PropertyChangeEvent e) { String prop = e.getPropertyName(); if (isVisible() && (e.getSource() == optionPane) && (JOptionPane.VALUE_PROPERTY.equals(prop) || JOptionPane.INPUT_VALUE_PROPERTY.equals(prop))) { Object value = optionPane.getValue(); if (value == JOptionPane.UNINITIALIZED_VALUE) { return; } optionPane.setValue( JOptionPane.UNINITIALIZED_VALUE); if (btnString1.equals(value)) { typedText = textField.getText(); String ucText = typedText.toUpperCase(); if (magicWord.equals(ucText)) { //如果输入有效，则清楚文本域并隐藏对话框 clearAndHide(); } else { //文本输入无效 textField.selectAll(); JOptionPane.showMessageDialog( CustomDialog.this, "对不起, \"" + typedText + "\" " + "是无效的输入。\n" + "请重新输入" + magicWord + ".", "再试一次", JOptionPane.ERROR_MESSAGE); typedText = null; textField.requestFocusInWindow(); } } else { //用户关闭了对话框或点击了“cancel” dd.setLabel("好吧！ " + "我们不能影响你的决定输入" + magicWord + "。"); typedText = null; clearAndHide(); } } } /** *方法说明：清楚文本域并隐藏痘翱蝌 */ public void clearAndHide() { textField.setText(null); setVisible(false); } }
package test16; import javax.swing.JOptionPane; import javax.swing.JDialog; import javax.swing.JButton; import javax.swing.JRadioButton; import javax.swing.ButtonGroup; import javax.swing.JLabel; import javax.swing.ImageIcon; import javax.swing.BoxLayout; import javax.swing.Box; import javax.swing.BorderFactory; import javax.swing.border.Border; import javax.swing.JTabbedPane; import javax.swing.JPanel; import javax.swing.JFrame; import java.beans.*; import java.awt.*; import java.awt.event.*; /** *Title: 对话框演示 *Description: 全面的演示各种类型的对话框的使用 *Filename: DialogDemo.java */ public class DialogDemo extends JPanel { private static final long serialVersionUID = 1L; JLabel label; ImageIcon icon = createImageIcon("images/middle.gif"); JFrame frame; String simpleDialogDesc = "简单的信息提示对话窗"; String iconDesc = "带有图标的对话窗"; String moreDialogDesc = "复杂信息对话窗"; CustomDialog customDialog; /** *方法说明：构造器，生成一个面板添加到JFrame中 *输入参数： *返回类型： */ public DialogDemo(JFrame frame) { super(new BorderLayout()); this.frame = frame; customDialog = new CustomDialog(frame, "tom", this); customDialog.pack(); //创建成员 JPanel frequentPanel = createSimpleDialogBox(); JPanel featurePanel = createFeatureDialogBox(); JPanel iconPanel = createIconDialogBox(); label = new JLabel("点击\"显示\" 按钮" + " 显示一个选择的对话框", JLabel.CENTER); //放置对象 Border padding = BorderFactory.createEmptyBorder(20,20,5,20); frequentPanel.setBorder(padding); featurePanel.setBorder(padding); iconPanel.setBorder(padding); //创建选项卡 JTabbedPane tabbedPane = new JTabbedPane(); tabbedPane.addTab("简单对话窗", null, frequentPanel, simpleDialogDesc); tabbedPane.addTab("复杂对话窗", null, featurePanel, moreDialogDesc); tabbedPane.addTab("图标对话窗", null, iconPanel, iconDesc); add(tabbedPane, BorderLayout.CENTER); add(label, BorderLayout.PAGE_END); label.setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); } /** *方法说明：设置按钮上的文字 *输入参数：String newText 添加的文字 *返回类型： */ void setLabel(String newText) { label.setText(newText); } /** *方法说明：获取图片 *输入参数：String path 图片完整路径和名字 *返回类型：ImageIcon 图片对象 */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = DialogDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** *方法说明：创建一个JPanel，给第一个选项卡 *输入参数： *返回类型： */ private JPanel createSimpleDialogBox() { final int numButtons = 4; JRadioButton[] radioButtons = new JRadioButton[numButtons]; final ButtonGroup group = new ButtonGroup(); JButton showItButton = null; final String defaultMessageCommand = "default"; final String yesNoCommand = "yesno"; final String yeahNahCommand = "yeahnah"; final String yncCommand = "ync"; //添加单选到数字 radioButtons[0] = new JRadioButton("只有“OK”按钮"); radioButtons[0].setActionCommand(defaultMessageCommand); radioButtons[1] = new JRadioButton("有“Yes/No”二个按钮"); radioButtons[1].setActionCommand(yesNoCommand); radioButtons[2] = new JRadioButton("有“Yes/No”两个按钮 " + "(程序添加文字)"); radioButtons[2].setActionCommand(yeahNahCommand); radioButtons[3] = new JRadioButton("有“Yes/No/Cancel”三个按钮 " + "(程序添加文字)"); radioButtons[3].setActionCommand(yncCommand); //将四个单选组成一个群 for (int i = 0; i < numButtons; i++) { group.add(radioButtons[i]); } //设置第一个为默认选择 radioButtons[0].setSelected(true); //定义“显示”按钮 showItButton = new JButton("显示"); //给“显示”按钮添加监听 showItButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String command = group.getSelection().getActionCommand(); //ok对话窗 if (command == defaultMessageCommand) { JOptionPane.showMessageDialog(frame, "鸡蛋不可能是绿色的！"); //yes/no 对话窗 } else if (command == yesNoCommand) { int n = JOptionPane.showConfirmDialog( frame, "你喜欢吃酸菜鱼吗?", "一个很无聊的问题！！", JOptionPane.YES_NO_OPTION); if (n == JOptionPane.YES_OPTION) {//选择yes setLabel("哇！我也是！"); } else if (n == JOptionPane.NO_OPTION) {//选择no setLabel("唉！我喜欢吃！"); } else { setLabel("快告诉我吧！"); } //yes/no (自己输入选项) } else if (command == yeahNahCommand) { Object[] options = {"是的", "不喜欢"}; int n = JOptionPane.showOptionDialog(frame, "你喜欢酸菜鱼吗?", "又一个无聊的问题！", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]); if (n == JOptionPane.YES_OPTION) { setLabel("你哄人的吧，我也喜欢。"); } else if (n == JOptionPane.NO_OPTION) { setLabel("其实我也不喜欢！"); } else { setLabel("这都不肯告诉我，小气鬼！"); } //yes/no/cancel 对话框 } else if (command == yncCommand) { Object[] options = {"是的，给我来一份。", "不，谢谢！", "不，我要水煮鱼！"}; //构造对话框 int n = JOptionPane.showOptionDialog(frame, "先生！我们这里有鲜美的酸菜鱼，您需要吗？", "服务生的问题。", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[2]); if (n == JOptionPane.YES_OPTION) { setLabel("你要的酸菜鱼来了！"); } else if (n == JOptionPane.NO_OPTION) { setLabel("好的，你需要其它的。"); } else if (n == JOptionPane.CANCEL_OPTION) { setLabel("好的，我们给你做水煮鱼！"); } else { setLabel("对不起！你还没有点菜呢！"); } } return; } }); return createPane(simpleDialogDesc + ":", radioButtons, showItButton); } /** *方法说明：提供给createSimpleDialogBox和createFeatureDialogBox方法 *方法说明：创建带提示信息、一列单选框和“显示”按钮 *输入参数：String description 提示帮助信息 *输入参数：JRadioButton[] radioButtons 单选框组 *输入参数：JButton showButton “显示”按钮 *返回类型：JPanel 添加好的面板 */ private JPanel createPane(String description, JRadioButton[] radioButtons, JButton showButton) { int numChoices = radioButtons.length; JPanel box = new JPanel(); JLabel label = new JLabel(description); box.setLayout(new BoxLayout(box, BoxLayout.PAGE_AXIS)); box.add(label); //添加radio for (int i = 0; i < numChoices; i++) { box.add(radioButtons[i]); } JPanel pane = new JPanel(new BorderLayout()); pane.add(box, BorderLayout.PAGE_START); pane.add(showButton, BorderLayout.PAGE_END); return pane; } /** *方法说明：提供给createSimpleDialogBox和createFeatureDialogBox方法 *方法说明：创建带提示信息、二列单选框和“显示”按钮 *输入参数：String description 提示帮助信息 *输入参数：JRadioButton[] radioButtons 单选框组 *输入参数：JButton showButton “显示”按钮 *返回类型：JPanel 添加好的面板 */ private JPanel create2ColPane(String description, JRadioButton[] radioButtons, JButton showButton) { JLabel label = new JLabel(description); int numPerColumn = radioButtons.length/2; JPanel grid = new JPanel(new GridLayout(0, 2)); for (int i = 0; i < numPerColumn; i++) { grid.add(radioButtons[i]); grid.add(radioButtons[i + numPerColumn]); } JPanel box = new JPanel(); box.setLayout(new BoxLayout(box, BoxLayout.PAGE_AXIS)); box.add(label); grid.setAlignmentX(0.0f); box.add(grid); JPanel pane = new JPanel(new BorderLayout()); pane.add(box, BorderLayout.PAGE_START); pane.add(showButton, BorderLayout.PAGE_END); return pane; } /** *方法说明：创建第三个选项卡的面板 *方法说明：这里都是实现showMessageDialog类，但是也可以指定图标 *输入参数： *返回类型：JPanel 构造好的面板 */ private JPanel createIconDialogBox() { JButton showItButton = null; final int numButtons = 6; JRadioButton[] radioButtons = new JRadioButton[numButtons]; final ButtonGroup group = new ButtonGroup(); final String plainCommand = "plain"; final String infoCommand = "info"; final String questionCommand = "question"; final String errorCommand = "error"; final String warningCommand = "warning"; final String customCommand = "custom"; radioButtons[0] = new JRadioButton("普通（没有图标）"); radioButtons[0].setActionCommand(plainCommand); radioButtons[1] = new JRadioButton("信息图标"); radioButtons[1].setActionCommand(infoCommand); radioButtons[2] = new JRadioButton("问题图标"); radioButtons[2].setActionCommand(questionCommand); radioButtons[3] = new JRadioButton("错误图标"); radioButtons[3].setActionCommand(errorCommand); radioButtons[4] = new JRadioButton("警告图标"); radioButtons[4].setActionCommand(warningCommand); radioButtons[5] = new JRadioButton("自定义图标"); radioButtons[5].setActionCommand(customCommand); for (int i = 0; i < numButtons; i++) { group.add(radioButtons[i]); } radioButtons[0].setSelected(true); showItButton = new JButton("显示"); showItButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String command = group.getSelection().getActionCommand(); //没有图标 if (command == plainCommand) { JOptionPane.showMessageDialog(frame, "水煮鱼里不要放酸菜！", "无图标", JOptionPane.PLAIN_MESSAGE); //信息图标 } else if (command == infoCommand) { JOptionPane.showMessageDialog(frame, "水煮鱼里不要放酸菜！", "信息图标", JOptionPane.INFORMATION_MESSAGE); //问题图标 } else if (command == questionCommand) { JOptionPane.showMessageDialog(frame, "请你吃饭前洗手，好吗？", "问题", JOptionPane.QUESTION_MESSAGE); //错误图标 } else if (command == errorCommand) { JOptionPane.showMessageDialog(frame, "对不起，你的信用卡没有资金了！", "错误信息", JOptionPane.ERROR_MESSAGE); //警告图标 } else if (command == warningCommand) { JOptionPane.showMessageDialog(frame, "警告！你严重透支信用卡，请尽快补齐金额！", "警告信息", JOptionPane.WARNING_MESSAGE); //自定义图标 } else if (command == customCommand) { JOptionPane.showMessageDialog(frame, "哈哈。我想用什么图标都可以！", "自定义对话窗", JOptionPane.INFORMATION_MESSAGE, icon); } } }); return create2ColPane(iconDesc + ":", radioButtons, showItButton); } /** *方法说明：创建一个JPanel，放在第二个选项卡上 *输入参数： *返回类型： */ private JPanel createFeatureDialogBox() { final int numButtons = 5; JRadioButton[] radioButtons = new JRadioButton[numButtons]; final ButtonGroup group = new ButtonGroup(); JButton showItButton = null; //定义操作命令 final String pickOneCommand = "pickone"; final String textEnteredCommand = "textfield"; final String nonAutoCommand = "nonautooption"; final String customOptionCommand = "customoption"; final String nonModalCommand = "nonmodal"; //定义radio数组 radioButtons[0] = new JRadioButton("选择一个"); radioButtons[0].setActionCommand(pickOneCommand); radioButtons[1] = new JRadioButton("输入信息"); radioButtons[1].setActionCommand(textEnteredCommand); radioButtons[2] = new JRadioButton("关闭按钮无效"); radioButtons[2].setActionCommand(nonAutoCommand); radioButtons[3] = new JRadioButton("输入校验" + "(用户输入信息)"); radioButtons[3].setActionCommand(customOptionCommand); radioButtons[4] = new JRadioButton("没有模式"); radioButtons[4].setActionCommand(nonModalCommand); //合成一个组群 for (int i = 0; i < numButtons; i++) { group.add(radioButtons[i]); } //设置第一个为默认选择 radioButtons[0].setSelected(true); showItButton = new JButton("显示"); showItButton.addActionListener(new ActionListener() { @SuppressWarnings("static-access") public void actionPerformed(ActionEvent e) { String command = group.getSelection().getActionCommand(); //选择一个 if (command == pickOneCommand) { Object[] possibilities = {"辣椒", "西红柿", "洋葱"}; //设置对话框 String s = (String)JOptionPane.showInputDialog( frame, //所属窗体 "请选择项目：\n" + "\"鸡蛋炒\"", //输出信息 "客户选择", JOptionPane.PLAIN_MESSAGE, //对话框模式 icon, //显示图标 possibilities, //选项内容 "辣椒"); //默认选项 //如果有选择 if ((s != null) && (s.length() > 0)) { setLabel("鸡蛋炒" + s + "!"); return; } //如果客户没有选择 setLabel("快点！"); //文本输入 } else if (command == textEnteredCommand) { String s = (String)JOptionPane.showInputDialog( frame, "选择一个配料\n" + "\"鸡蛋炒\"", "客户输入", JOptionPane.PLAIN_MESSAGE, icon, null, "辣椒"); //如果用户有输入 if ((s != null) && (s.length() > 0)) { setLabel("你要的是鸡蛋炒" + s + "！"); return; } //如果返回的是空或者是null。 setLabel("快些选择！"); //关闭按钮无效 } else if (command == nonAutoCommand) { //构造一个对话框面板 final JOptionPane optionPane = new JOptionPane( "关闭这个对话框\n" + "请点击下面的按钮\n" + "明白吗？", JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION); JDialog.setDefaultLookAndFeelDecorated(false); //构造一个对话框 final JDialog dialog = new JDialog(frame, "点击一个按钮", true); //将对话框面板添加到对话框中 dialog.setContentPane(optionPane); //设置对话框关闭时的操作模式 dialog.setDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE); dialog.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { //当点击关闭按钮 setLabel("阻碍用户视图关闭窗体！"); } }); JDialog.setDefaultLookAndFeelDecorated(true); optionPane.addPropertyChangeListener( new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent e) { String prop = e.getPropertyName(); if (dialog.isVisible() && (e.getSource() == optionPane) && (JOptionPane.VALUE_PROPERTY.equals(prop))) { //如果你要阻止关闭按钮，可以在这里进行处理。 dialog.setVisible(false); } } }); dialog.pack(); dialog.setLocationRelativeTo(frame); dialog.setVisible(true); int value = ((Integer)optionPane.getValue()).intValue(); if (value == JOptionPane.YES_OPTION) { setLabel("好的"); } else if (value == JOptionPane.NO_OPTION) { setLabel("试图点击关闭按钮来关闭一个不能关闭的对话框！" + "你不能！"); } else { setLabel("窗体可以使用ESC键关闭。"); } //自己定义版面 } else if (command == customOptionCommand) { customDialog.setLocationRelativeTo(frame); customDialog.setVisible(true); String s = customDialog.getValidatedText(); if (s != null) { //The text is valid. setLabel("欢迎你！" + "你已经进入了\"" + s + "\"。"); } //没有模式 } else if (command == nonModalCommand) { //创建一个对话框 final JDialog dialog = new JDialog(frame, "一个没有模式的对话框"); //使用html语言来显示信息 JLabel label = new JLabel("

" + "这是一个没有模式的对话框" + "你可以使用更多的格式" + "甚至可以使用主窗体！"); label.setHorizontalAlignment(JLabel.CENTER); Font font = label.getFont(); label.setFont(label.getFont().deriveFont(font.PLAIN, 14.0f)); JButton closeButton = new JButton("关闭"); closeButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { dialog.setVisible(false); dialog.dispose(); } }); JPanel closePanel = new JPanel(); closePanel.setLayout(new BoxLayout(closePanel, BoxLayout.LINE_AXIS)); closePanel.add(Box.createHorizontalGlue()); closePanel.add(closeButton); closePanel.setBorder(BorderFactory. createEmptyBorder(0,0,5,5)); JPanel contentPane = new JPanel(new BorderLayout()); contentPane.add(label, BorderLayout.CENTER); contentPane.add(closePanel, BorderLayout.PAGE_END); contentPane.setOpaque(true); dialog.setContentPane(contentPane); //显示窗体 dialog.setSize(new Dimension(300, 150)); dialog.setLocationRelativeTo(frame); dialog.setVisible(true); } } }); return createPane(moreDialogDesc + ":", radioButtons, showItButton); } public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); JDialog.setDefaultLookAndFeelDecorated(true); //创建和设置一个窗体 JFrame frame = new JFrame("DialogDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置一个面板 Container contentPane = frame.getContentPane(); contentPane.setLayout(new GridLayout(1,1)); contentPane.add(new DialogDemo(frame)); //显示窗体 frame.pack(); frame.setVisible(true); } }
package test17; import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; /** * Title: 文件对话框演示 * Description: 演示打开文件对话框和保存文件对话框，使用了文件过滤。 * Filename: FileChooserDemo.java */ public class FileChooserDemo extends JPanel implements ActionListener { private static final long serialVersionUID = 1L; static private final String newline = "\n"; JButton openButton, saveButton; JTextArea log; JFileChooser fc; public FileChooserDemo() { super(new BorderLayout()); log = new JTextArea(15,40); log.setMargin(new Insets(10,10,10,10)); log.setEditable(false); JScrollPane logScrollPane = new JScrollPane(log); //创建一个文件过滤，使用当前目录 fc = new JFileChooser("."); //过滤条件在MyFilter类中定义 fc.addChoosableFileFilter(new MyFilter()); openButton = new JButton("打开文件", createImageIcon("images/Open16.gif")); openButton.addActionListener(this); saveButton = new JButton("保存文件", createImageIcon("images/Save16.gif")); saveButton.addActionListener(this); //构建一个面板，添加“打开文件”和“保存文件” JPanel buttonPanel = new JPanel(); buttonPanel.add(openButton); buttonPanel.add(saveButton); add(buttonPanel, BorderLayout.PAGE_START); add(logScrollPane, BorderLayout.CENTER); } /** *方法说明：事件处理 *输入参数： *返回类型： */ public void actionPerformed(ActionEvent e) { //当点击“打开文件”按钮 if (e.getSource() == openButton) { int returnVal = fc.showOpenDialog(FileChooserDemo.this); if (returnVal == JFileChooser.APPROVE_OPTION) { File file = fc.getSelectedFile(); //在这里添加一些对文件的处理 log.append("打开文件: " + file.getName() + newline); } else { log.append("打开文件被用户取消！" + newline); } //点击“保存文件”按钮 } else if (e.getSource() == saveButton) { int returnVal = fc.showSaveDialog(FileChooserDemo.this); if (returnVal == JFileChooser.APPROVE_OPTION) { File file = fc.getSelectedFile(); //在这里添加一些对文件的处理 log.append("保存文件: " + file.getName() + newline); } else { log.append("保存文件被用户取消！" + newline); } } } /** *方法说明：获取图像对象 *输入参数：String path 图片路径 *返回类型：ImageIcon 图片对象 */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = FileChooserDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); JDialog.setDefaultLookAndFeelDecorated(true); //创建窗体 JFrame frame = new JFrame("FileChooserDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建一个面板 JComponent newContentPane = new FileChooserDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } }
package test17; import java.io.File; import javax.swing.filechooser.*; /** * Title: 文件过滤器演示 * Description: FileChooserDemo文件使用的文件过滤器 * Filename: MyFilter.java */ public class MyFilter extends FileFilter { @SuppressWarnings("unused") private String files; public boolean accept(File f) { if (f.isDirectory()) { return true; } String extension = getExtension(f); if (extension != null) { if (extension.equals("java")) {//定义过滤Java文件 return true; } else { return false; } } return false; } //过滤器描述 public String getDescription() { return "Java"; } /** *方法说明：获取文件扩展名 */ public static String getExtension(File f) { String ext = null; String s = f.getName(); int i = s.lastIndexOf('.'); if (i > 0 && i < s.length() - 1) { ext = s.substring(i+1).toLowerCase(); } return ext; } }
package test18; import javax.swing.*; import java.awt.*; import java.awt.event.*; /** * Description: 这里演示使用html语言在swing面板上构造显示信息 * Filename: HtmlDemo.java */ public class HtmlDemo extends JPanel implements ActionListener { private static final long serialVersionUID = 1L; JLabel theLabel; JTextArea htmlTextArea; /** *方法说明：构造器，描述窗体中的成员 *输入参数： *返回类型： */ public HtmlDemo() { setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS)); String initialText = "\n" + "颜色和字体测试:\n" + "

\n" + "
• red\n" + "
• blue\n" + "
• green\n" + "
• small\n" + "
• large\n" + "
• italic\n" + "
• bold\n" + "

\n"; //定义一个文本框 htmlTextArea = new JTextArea(10, 20); htmlTextArea.setText(initialText); JScrollPane scrollPane = new JScrollPane(htmlTextArea); //定义按钮 JButton changeTheLabel = new JButton("改变显示"); changeTheLabel.setMnemonic(KeyEvent.VK_C); changeTheLabel.setAlignmentX(Component.CENTER_ALIGNMENT); changeTheLabel.addActionListener(this); //定义标签 theLabel = new JLabel(initialText) { private static final long serialVersionUID = 1L; public Dimension getPreferredSize() { return new Dimension(200, 200); } public Dimension getMinimumSize() { return new Dimension(200, 200); } public Dimension getMaximumSize() { return new Dimension(200, 200); } }; //设置标签的对齐方式 theLabel.setVerticalAlignment(SwingConstants.CENTER); theLabel.setHorizontalAlignment(SwingConstants.CENTER); //构造一个带边框的左边的编辑面板 JPanel leftPanel = new JPanel(); leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.PAGE_AXIS)); leftPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder( "编辑HTML，点击按钮显示结果。"), BorderFactory.createEmptyBorder(10,10,10,10))); leftPanel.add(scrollPane); leftPanel.add(Box.createRigidArea(new Dimension(0,10))); leftPanel.add(changeTheLabel); //构造一个带边框的右边显示的面板 JPanel rightPanel = new JPanel(); rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.PAGE_AXIS)); rightPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("这里使用标签显示HTML结果"), BorderFactory.createEmptyBorder(10,10,10,10))); rightPanel.add(theLabel); setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); add(leftPanel); add(Box.createRigidArea(new Dimension(10,0))); add(rightPanel); } /** *方法说明：事件监听，当用户点击按钮触发 *输入参数： *返回类型： */ public void actionPerformed(ActionEvent e) { theLabel.setText(htmlTextArea.getText()); } /** *方法说明：主方法 *输入参数： *返回类型： */ public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); //创建窗体 JFrame frame = new JFrame("HtmlDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建面板 JComponent newContentPane = new HtmlDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } }
package test19; import java.awt.*; import java.awt.event.*; import javax.swing.JPopupMenu; import javax.swing.JMenu; import javax.swing.JMenuItem; import javax.swing.JCheckBoxMenuItem; import javax.swing.JRadioButtonMenuItem; import javax.swing.ButtonGroup; import javax.swing.JMenuBar; import javax.swing.KeyStroke; import javax.swing.ImageIcon; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JScrollPane; import javax.swing.JFrame; /** * Title: 菜单演示 * Description: 演示菜单的建立和快捷键的使用。 * Filename: MenuDemo.java */ public class MenuDemo implements ActionListener, ItemListener { JTextArea output; JScrollPane scrollPane; String newline = "\n"; /** *方法说明：组建菜单栏 *输入参数： *返回类型： */ public JMenuBar createMenuBar() { JMenuBar menuBar; JMenu menu, submenu; JMenuItem menuItem; JRadioButtonMenuItem rbMenuItem; JCheckBoxMenuItem cbMenuItem; //定义菜单条 menuBar = new JMenuBar(); //定义第一个菜单 menu = new JMenu("(A)菜单"); menu.setMnemonic(KeyEvent.VK_A); menuBar.add(menu); //下面开始定义菜单项 //只有文字 menuItem = new JMenuItem("(O)只有文本的菜单", KeyEvent.VK_O); //设置快捷键 menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_1, ActionEvent.ALT_MASK)); //添加监听 menuItem.addActionListener(this); menu.add(menuItem); //有图标还有文字 ImageIcon icon = createImageIcon("images/middle.gif"); menuItem = new JMenuItem("(B)有图标和文字的菜单", icon); menuItem.setMnemonic(KeyEvent.VK_B); menuItem.addActionListener(this); menu.add(menuItem); //只有图标 menuItem = new JMenuItem(icon); menuItem.setMnemonic(KeyEvent.VK_D); menuItem.addActionListener(this); menu.add(menuItem); //定义一组radio button（单选按钮）菜单 menu.addSeparator(); ButtonGroup group = new ButtonGroup(); rbMenuItem = new JRadioButtonMenuItem("(R)使用radio的菜单"); rbMenuItem.setSelected(true); rbMenuItem.setMnemonic(KeyEvent.VK_R); group.add(rbMenuItem); rbMenuItem.addActionListener(this); menu.add(rbMenuItem); rbMenuItem = new JRadioButtonMenuItem("(d)另外一个radio菜单"); rbMenuItem.setMnemonic(KeyEvent.VK_D); group.add(rbMenuItem); rbMenuItem.addActionListener(this); menu.add(rbMenuItem); //定义一组check box（检查盒）菜单 menu.addSeparator(); cbMenuItem = new JCheckBoxMenuItem("(C)使用检查盒的菜单"); cbMenuItem.setMnemonic(KeyEvent.VK_C); cbMenuItem.addItemListener(this); menu.add(cbMenuItem); cbMenuItem = new JCheckBoxMenuItem("(H)另外一个检查盒"); cbMenuItem.setMnemonic(KeyEvent.VK_H); cbMenuItem.addItemListener(this); menu.add(cbMenuItem); //定义一个带子菜单 menu.addSeparator(); submenu = new JMenu("(S)带有子菜单"); submenu.setMnemonic(KeyEvent.VK_S); //定义子菜单 menuItem = new JMenuItem("这是子菜单"); //定义快捷键 menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_2, ActionEvent.ALT_MASK)); menuItem.addActionListener(this); submenu.add(menuItem); menuItem = new JMenuItem("子菜单项"); menuItem.addActionListener(this); submenu.add(menuItem); menu.add(submenu); //定义第二个菜单 menu = new JMenu("(N)第二个菜单"); menu.setMnemonic(KeyEvent.VK_N); menuBar.add(menu); return menuBar; } /** *方法说明：构建面板 *输入参数： *返回类型： */ public Container createContentPane() { //构造一个面板 JPanel contentPane = new JPanel(new BorderLayout()); contentPane.setOpaque(true); //定义一个文本域 output = new JTextArea(5, 30); output.setEditable(false); scrollPane = new JScrollPane(output); //将文本域添加到面板中 contentPane.add(scrollPane, BorderLayout.CENTER); return contentPane; } /** *方法说明：构建弹出菜单 *输入参数： *返回类型： */ public void createPopupMenu() { JMenuItem menuItem; //构件弹出菜单 JPopupMenu popup = new JPopupMenu(); ImageIcon openicon = createImageIcon("images/Open16.gif"); menuItem = new JMenuItem("打开文件",openicon); menuItem.addActionListener(this); popup.add(menuItem); ImageIcon saveicon = createImageIcon("images/Save16.gif"); menuItem = new JMenuItem("保存文件",saveicon); menuItem.addActionListener(this); popup.add(menuItem); //添加一个监听给文本域，以便点击右键时响应 MouseListener popupListener = new PopupListener(popup); output.addMouseListener(popupListener); } /** *方法说明：监听普通的菜单选择 *输入参数：ActionEvent e 事件 *返回类型： */ public void actionPerformed(ActionEvent e) { JMenuItem source = (JMenuItem)(e.getSource()); String s = "监测事件。" + newline + " 事件源: " + source.getText() + " (选择对象" + getClassName(source) + ")"; output.append(s + newline); } /** *方法说明：监听检查盒菜单选择项 *输入参数：ItemEvent e 检查盒触发的事件 *返回类型： */ public void itemStateChanged(ItemEvent e) { JMenuItem source = (JMenuItem)(e.getSource()); String s = "菜单项监听" + newline + " 事件源: " + source.getText() + " (选择对象 " + getClassName(source) + ")" + newline + " 新的状态: " + ((e.getStateChange() == ItemEvent.SELECTED) ? "选择":"不选择"); output.append(s + newline); } /** *方法说明：获得类的名字 *输入参数： *返回类型： */ protected String getClassName(Object o) { String classString = o.getClass().getName(); int dotIndex = classString.lastIndexOf("."); return classString.substring(dotIndex+1); } /** *方法说明：根据路径查找图片 *输入参数：String path 图片的路径 *返回类型：ImageIcon 图片对象 */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = MenuDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); //创建一个窗体 JFrame frame = new JFrame("MenuDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建菜单，并添加到面板中 MenuDemo demo = new MenuDemo(); frame.setJMenuBar(demo.createMenuBar()); frame.setContentPane(demo.createContentPane()); //生成弹出菜单 demo.createPopupMenu(); //显示窗体 frame.setSize(450, 260); frame.setVisible(true); } //弹出菜单监听类 class PopupListener extends MouseAdapter { JPopupMenu popup; PopupListener(JPopupMenu popupMenu) { popup = popupMenu; } public void mousePressed(MouseEvent e) { maybeShowPopup(e); } public void mouseReleased(MouseEvent e) { maybeShowPopup(e); } private void maybeShowPopup(MouseEvent e) { if (e.isPopupTrigger()) { popup.show(e.getComponent(), e.getX(), e.getY()); } } } }
package test20; import javax.swing.JToolBar; import javax.swing.JButton; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JTextArea; import javax.swing.JScrollPane; import javax.swing.JPanel; import java.net.URL; import java.awt.*; import java.awt.event.*; /** * Title: 工具栏演示 * Description: 提供一个工具栏，包括“打开”、“保存”、“搜索”工具按钮 * Filename: ToolBarDemo.java */ public class ToolBarDemo extends JPanel implements ActionListener { private static final long serialVersionUID = 1L; protected JTextArea textArea; protected String newline = "\n"; static final private String OPEN = "OPEN"; static final private String SAVE = "SAVE"; static final private String SEARCH = "SEARCH"; /** *方法说明：构造器 *输入参数： *返回类型： */ public ToolBarDemo() { super(new BorderLayout()); //创建工具栏 JToolBar toolBar = new JToolBar(); addButtons(toolBar); //创建一个文本域，用来输出一些信息 textArea = new JTextArea(15, 30); textArea.setEditable(false); JScrollPane scrollPane = new JScrollPane(textArea); //安放成员 setPreferredSize(new Dimension(450, 110)); add(toolBar, BorderLayout.PAGE_START); add(scrollPane, BorderLayout.CENTER); } /** *方法说明：构建工具栏 *输入参数：JToolBar toolBar 工具条 *返回类型： */ protected void addButtons(JToolBar toolBar) { JButton button = null; //第一个按钮，“打开” button = makeNavigationButton("Open16", OPEN, "打开一个文件！", "打开"); toolBar.add(button); //第二个按钮，“保存” button = makeNavigationButton("Save16", SAVE, "保存当前文件！", "保存"); toolBar.add(button); //第三个按钮，“搜索” button = makeNavigationButton("Search16", SEARCH, "搜索文件中的字符！", "搜索"); toolBar.add(button); } /** *方法说明：构造工具栏上的按钮 *输入参数： *返回类型： */ protected JButton makeNavigationButton(String imageName, String actionCommand, String toolTipText, String altText) { //搜索图片 String imgLocation = "images/" + imageName + ".gif"; URL imageURL = ToolBarDemo.class.getResource(imgLocation); //初始化工具按钮 JButton button = new JButton(); //设置按钮的命令 button.setActionCommand(actionCommand); //设置提示信息 button.setToolTipText(toolTipText); button.addActionListener(this); if (imageURL != null) { //找到图像 button.setIcon(new ImageIcon(imageURL)); } else { //没有图像 button.setText(altText); System.err.println("Resource not found: " + imgLocation); } return button; } /** *方法说明：事件监听 *输入参数： *返回类型： */ public void actionPerformed(ActionEvent e) { String cmd = e.getActionCommand(); String description = null; if (OPEN.equals(cmd)) { //点击第一个按钮 description = "打开一个文件操作！"; } else if (SAVE.equals(cmd)) { //点击第二个按钮 description = "保存文件操作"; } else if (SEARCH.equals(cmd)) { //点击第三个按钮 description = "搜索字符操作"; } displayResult("如果这里是真正的程序，你将进入： " + description); } protected void displayResult(String actionDescription) { textArea.append(actionDescription + newline); } public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); //定义窗体 JFrame frame = new JFrame("ToolBarDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //定义面板 ToolBarDemo newContentPane = new ToolBarDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); //显示窗体 frame.pack(); frame.setVisible(true); } }