Java GUI File 源码实例

package QuizCardBuilder; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.util.*; import javax.swing.*; public class QuizCardBuilder { public class SaveMenuItemListener implements ActionListener { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub QuizCard card=new QuizCard(question.getText(),answer.getText()); cardList.add(card); JFileChooser fileSave=new JFileChooser(); fileSave.showSaveDialog(frame); saveFile(fileSave.getSelectedFile()); } private void saveFile(File file) { // TODO Auto-generated method stub try{ BufferedWriter writer=new BufferedWriter(new FileWriter(file)); for(QuizCard card:cardList){ writer.write(card.getQuestion()+"/"); writer.write(card.getAnswer()+"\n"); } writer.close(); }catch(IOException ex){ System.out.println("Couldn't write the cardList out"); ex.printStackTrace(); } } } public class NewMenuItemListener implements ActionListener { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub cardList.clear(); clearCard(); } } public class NextCardListener implements ActionListener { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub QuizCard card=new QuizCard(question.getText(),answer.getText()); cardList.add(card); clearCard(); } } private void clearCard() { // TODO Auto-generated method stub question.setText(""); answer.setText(""); question.requestFocus(); } private JTextArea question; private JTextArea answer; private ArrayList<QuizCard> cardList; private JFrame frame; public static void main(String[] args){ QuizCardBuilder builder=new QuizCardBuilder(); builder.go(); } private void go() { // TODO Auto-generated method stub frame= new JFrame("Quiz Card Builder"); JPanel mainPanel= new JPanel(); Font bigFont =new Font("sanserif",Font.BOLD,24); question=new JTextArea(6,20); question.setLineWrap(true); question.setWrapStyleWord(true); question.setFont(bigFont); JScrollPane qScroller=new JScrollPane(question); qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); answer=new JTextArea(6,20); answer.setLineWrap(true); answer.setWrapStyleWord(true); answer.setFont(bigFont); JScrollPane aScroller=new JScrollPane(answer); aScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); aScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); JButton nextButton=new JButton("Next Card"); cardList=new ArrayList<QuizCard>(); JLabel qLabel=new JLabel("Question:"); JLabel aLabel=new JLabel("Answer:"); mainPanel.add(qLabel); mainPanel.add(qScroller); mainPanel.add(aLabel); mainPanel.add(aScroller); mainPanel.add(nextButton); nextButton.addActionListener(new NextCardListener()); JMenuBar menuBar= new JMenuBar(); JMenu fileMenu=new JMenu("file"); JMenuItem newMenuItem= new JMenuItem("New"); JMenuItem saveMenuItem=new JMenuItem("Save"); newMenuItem.addActionListener(new NewMenuItemListener()); saveMenuItem.addActionListener(new SaveMenuItemListener()); fileMenu.add(newMenuItem); fileMenu.add(saveMenuItem); menuBar.add(fileMenu); frame.setJMenuBar(menuBar); frame.getContentPane().add(BorderLayout.CENTER, mainPanel); frame.setSize(500, 600); frame.setVisible(true); } }