java - JButton 和 JFileChooser 的错误消息

Question

我想要一个带有 JFileChooser 操作的按钮。这是我写的代码:

public class Main {

private static String fullPath;
private JFileChooser inputFile;

public static void main(String args[]) throws FileNotFoundException, IOException {
    try {

        GridBagConstraints gbc = new GridBagConstraints();

        JButton inputButton = new JButton("Browse input file");

        myPanel.add(inputButton, gbc);

        inputButton.addActionListener(new ActionListener() {
        public void ActionPerformed(ActionEvent e) {
        JFileChooser inputFile = new JFileChooser();
        inputFile.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

        File file1 = inputFile.getSelectedFile();
        String fullpathTemp = (String) file1.getAbsolutePath();
        fullPath = fullpathTemp;
            }
                public void actionPerformed(ActionEvent e) {
                throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }
        });


} catch (Exception e) {
        System.err.println("Error: " + e.getMessage());
    } finally {
    }
}
}

但问题是，当我运行它时，我收到一条很长的错误消息，其中包含以下内容:

Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: Not     supported yet.
at main.Main$1.actionPerformed(Main.java:200)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)

Answer 1

此处的 ActionListener 显式抛出 UnsupportedOperationException。将 JFileChooser 功能移至 ActionListener 中:

input_button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        JFileChooser inputFile = new JFileChooser();
        inputfile.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        if (inputfile.showOpenDialog(myFrame) == JFileChooser.APPROVE_OPTION) {
            File file1 = inputFile.getSelectedFile();
            String fullpathTemp = (String) file1.getAbsolutePath();
            ...
        }
    }
});