Question

我正在尝试将 jcheckbox 添加到JTable的第一列，该列使用DefaultTableModel。我尝试为该列返回Boolean.class，但它不起作用。

我在最后一列中已经有了 jcombobox ，但是使用我用来添加 jcheckbox 的相同方法不起作用。我在网上读到，如果在列中呈现Boolean.class，java会自动为您返回复选框，但使用它也不起作用。我认为这可能是我订购组件的方式的问题。

//import statements. 
public class CourseSelection extends GUIDesign implements ActionListener{
    // lot of extraneous stuff,
    JLabel termLabel;
    String term;

    JLabel departmentLabel;
    String department;
    String[] columns = {
        "Select", "CRN", "Title", "Instructor", "Time", 
        "Days", "Location", "Section", "Code", "Mode of Grading"
    };
    int courses;
    Object[][] data;

    String[] modes = {"Audit", "Pass/Fail", "Letter Grding"};

    // create the table here, with model. 
    JTable table;

    DefaultTableModel model = new DefaultTableModel() {
        Class[] types = {
            Boolean.class, String.class, String.class, String.class, 
            String.class, String.class, String.class, String.class, 
            String.class, Object.class
        };
        // making sure that it returns boolean.class.   
        @Override
        public Class getColumnClass(int columnIndex) {
            return types[columnIndex];
        }
    };

    JPanel termPanel = new JPanel();
    JPanel departmentPanel = new JPanel();

    JButton backButton = new JButton("Back");
    JButton registerButton = new JButton("Register");
    JButton refreshButton = new JButton("Refresh");

    public CourseSelection(GTPort gPort) {
        super("Course Selection", 3);
        setLayout(new BoxLayout(this,BoxLayout.PAGE_AXIS));
        header = new JPanel();
        header.setSize(getWidth(), 30);
        body = new JPanel();
        body.setLayout(new BoxLayout(body,BoxLayout.Y_AXIS));

        header.setBackground(color);
        title.setFont(new Font("Helvetica", 1,20));
        header.add(title);

        termLabel = new JLabel("Term:        " + term);

        data = new Object[25][10];
        model = new DefaultTableModel(data, columns);
        table = new JTable(model);
        table.setModel(model);

        departmentLabel = new JLabel("Department: " + department);

        termPanel.add(termLabel);
        departmentPanel.add(departmentLabel);

        JComboBox box = new JComboBox(modes);

        JCheckBox checkBox = new JCheckBox();

        // lot of other code I tried that doesn't work. 
        // table.getColumnModel().getColumn(1)
        //      .setCellEditor(table.getDefaultEditor(Boolean.class));  
        // table.getColumnModel().getColumn(1)
        //      .setCellRenderer(table.getDefaultRenderer(Boolean.class));  

        // table.setDefaultEditor(Boolean.class, new DefaultCellEditor(checkBox));
        // table.setDefaultRenderer(Boolean.class, new DefaultTableCellRenderer());

        // model.getColumnModel().getColumn(1)
        //      .setCellEditor(new DefaultCellEditor(checkBox));
        // model.getColumnModel().getColumn(1)
        //      .setCellRenderer(new DefaultTableCellRenderer());

        table.getColumnModel().getColumn(9)
             .setCellEditor(new DefaultCellEditor(box));
        //   .setCellEditor(new DefaultCellEditor(box));

        // table = new JTable(model);

        body.add(termPanel);
        body.add(departmentPanel);

        body.add(table.getTableHeader());
        body.add(table);

        // body.add(body);
        buttonPanel.add(backButton);
        buttonPanel.add(refreshButton);
        buttonPanel.add(registerButton);

        backButton.addActionListener(this);
        refreshButton.addActionListener(this);
        registerButton.addActionListener(this);

        add(header);
        add(body);
        add(buttonPanel);

        gtPort = gPort;
    }
}

Answer 1

您不会覆盖模型中的getColumnClass()：

model = new DefaultTableModel(data, columns); // nothing overridden here
table = new JTable(model);
table.setModel(model);

覆盖它，它会起作用：

model = new DefaultTableModel(data, columns) {
    @Override
    public Class<?> getColumnClass(int column) {
        ...
    }
};
table = new JTable(model);
table.setModel(model);

如何通过添加布尔列将JCheckBox添加到DefaultTableModel？

1 个答案: