📄 votedialog.java
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import javax.swing.*;import java.awt.*;import java.awt.event.*;public class VoteDialog extends JPanel { JLabel label; JFrame frame; String simpleDialogDesc = "The candidates"; public VoteDialog(JFrame frame) { this.frame = frame; JLabel title; // Create the components. JPanel choicePanel = createSimpleDialogBox(); System.out.println("passed createSimpleDialogBox"); title = new JLabel("Click the \"Vote\" button" + " once you have selected a candidate.", JLabel.CENTER); label = new JLabel("Vote now!", JLabel.CENTER); label.setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); choicePanel.setBorder(BorderFactory.createEmptyBorder(20,20,5,20)); // Set the layout. setLayout(new BorderLayout()); add(title, BorderLayout.NORTH); add(label, BorderLayout.SOUTH); add(choicePanel, BorderLayout.CENTER); } void setLabel(String newText) { label.setText(newText); } private JPanel createSimpleDialogBox() { final int numButtons = 4; JRadioButton[] radioButtons = new JRadioButton[numButtons]; final ButtonGroup group = new ButtonGroup(); JButton voteButton = null; final String defaultMessageCommand = "default"; final String yesNoCommand = "yesno"; final String yeahNahCommand = "yeahnah"; final String yncCommand = "ync"; radioButtons[0] = new JRadioButton("<html>Candidate 1: <font color=red>Sparky the Dog</font></html>"); radioButtons[0].setActionCommand(defaultMessageCommand); radioButtons[1] = new JRadioButton("<html>Candidate 2: <font color=green>Shady Sadie</font></html>"); radioButtons[1].setActionCommand(yesNoCommand); radioButtons[2] = new JRadioButton("<html>Candidate 3: <font color=blue>R.I.P. McDaniels</font></html>"); radioButtons[2].setActionCommand(yeahNahCommand); radioButtons[3] = new JRadioButton("<html>Candidate 4: <font color=maroon>Duke the Java<font size=-2><sup>TM</sup></font size> Platform Mascot</font></html>"); radioButtons[3].setActionCommand(yncCommand); for (int i = 0; i < numButtons; i++) { group.add(radioButtons[i]); } // Select the first button by default. radioButtons[0].setSelected(true); voteButton = new JButton("Vote"); voteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String command = group.getSelection().getActionCommand(); // ok dialog if (command == defaultMessageCommand) { JOptionPane.showMessageDialog(frame, "This candidate is a dog. Invalid vote."); // yes/no dialog } else if (command == yesNoCommand) { int n = JOptionPane.showConfirmDialog( frame, "This candidate is a convicted felon. \nDo you still want to vote for her?", "A Follow-up Question", JOptionPane.YES_NO_OPTION); if (n == JOptionPane.YES_OPTION) { setLabel("OK. Keep an eye on your wallet."); } else if (n == JOptionPane.NO_OPTION) { setLabel("Whew! Good choice."); } else { setLabel("It is your civic duty to cast your vote."); } // yes/no (with customized wording) } else if (command == yeahNahCommand) { Object[] options = {"Yes, please", "No, thanks"}; int n = JOptionPane.showOptionDialog(frame, "This candidate is deceased. \nDo you still want to vote for him?", "A Follow-up Question", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]); if (n == JOptionPane.YES_OPTION) { setLabel("I hope you don't expect much from your candidate."); } else if (n == JOptionPane.NO_OPTION) { setLabel("Whew! Good choice."); } else { setLabel("It is your civic duty to cast your vote."); } // yes/no/cancel (with customized wording) } else if (command == yncCommand) { Object[] options = {"Yes!", "No, I'll pass", "Well, if I must"}; int n = JOptionPane.showOptionDialog(frame, "Duke is a cartoon mascot. \nDo you " + "still want to cast your vote?", "A Follow-up Question", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[2]); if (n == JOptionPane.YES_OPTION) { setLabel("Excellent choice."); } else if (n == JOptionPane.NO_OPTION) { setLabel("Whatever you say. It's your vote."); } else if (n == JOptionPane.CANCEL_OPTION) { setLabel("Well, I'm certainly not going to make you vote."); } else { setLabel("It is your civic duty to cast your vote."); } } return; } }); System.out.println("calling createPane"); return createPane(simpleDialogDesc + ":", radioButtons, voteButton); } 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.Y_AXIS)); box.add(label); for (int i = 0; i < numChoices; i++) { box.add(radioButtons[i]); } JPanel pane = new JPanel(); pane.setLayout(new BorderLayout()); pane.add(box, BorderLayout.NORTH); pane.add(showButton, BorderLayout.SOUTH); System.out.println("returning pane"); return pane; } public static void main(String[] args) { JFrame frame = new JFrame("VoteDialog"); Container contentPane = frame.getContentPane(); contentPane.setLayout(new GridLayout(1,1)); contentPane.add(new VoteDialog(frame)); // Exit when the window is closed. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); }}⌨️ 快捷键说明
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