如何通過添加布爾列將JCheckBox添加到DefaultTableModel？

Question

我正在嘗試將一個jcheckbox添加到JTable的第一列，該列使用一個DefaultTableModel。我試着爲該列返回一個Boolean.class，但它不起作用。

我已經有一個的JComboBox在最後一列，但使用我用於添加，爲了增加JCheckBox的不起作用的方法相同。我在線閱讀，如果您在列中呈現Boolean.class，但是使用它也不起作用，java會自動爲您返回複選框。我認爲這可能是我訂購組件的方式中的一個問題。

//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

你不要在你的模型覆蓋getColumnClass()：

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

覆蓋它，它會工作：

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