Java JTable 组合框验证

Question

我想在这里做 3 件事：

首先，我试图让组合框显示 "not feed" 当你启动程序时，在它启动的那一刻什么都不显示，只有当我点击组合它显示选项 "feed" 和 "not feed"。
其次，我正在尝试对组合框进行验证，当我接下来单击 JButton 时，它将验证组合框是否全部 "feed" 如果是的话下一步，否则会弹出 "check again"

最后，我想让前 4 列的单元格不可编辑，最后一列可编辑。

public class DosageTableHelper  {
private static JTable toDoTable;
private static JScrollPane jpane;
private static int counter=1;
public static DefaultTableModel getElderlyFromQueryDos(String timing,String position) throws SQLException {
    SQLObject so = new SQLObject();
    ResultSet rs = null;

    if(timing.equalsIgnoreCase("Morning")){
        PreparedStatement stmt  = so.getPreparedStatementWithKey("SELECT morningdosage FROM et_elderly WHERE name = ?");
        stmt.setString(1,position);
        stmt.executeQuery();
        System.out.println(stmt);
        rs = stmt.getResultSet();
    }
    else if(timing.equalsIgnoreCase("Afternoon")){
        PreparedStatement stmt  = so.getPreparedStatementWithKey("SELECT afternoondosage FROM et_elderly WHERE name = ?");
        stmt.setString(1,position);
        stmt.executeQuery();
        System.out.println(stmt);
        rs = stmt.getResultSet();
    }
    else if(timing.equalsIgnoreCase("Noon")){
        PreparedStatement stmt  = so.getPreparedStatementWithKey("SELECT noondosage FROM et_elderly WHERE name = ?");
        stmt.setString(1,position);
        stmt.executeQuery();
        System.out.println(stmt);
        rs = stmt.getResultSet();
    }
    return (DefaultTableModel) buildTableModel(rs);
}



@SuppressWarnings("unchecked")
public static DefaultTableModel buildTableModel(ResultSet rs) throws SQLException {
    ArrayList<DosageObject> DosageList=null;


    System.out.println(rs);
    try {
        while(rs.next()){
            ByteArrayInputStream in = new ByteArrayInputStream(rs.getBytes(1));
            ObjectInputStream is = new ObjectInputStream(in);
            Object retrieveDosBlob =(Object) is.readObject();
            if(retrieveDosBlob instanceof  ArrayList<?>){
                DosageList=((ArrayList<DosageObject>) retrieveDosBlob);
            }
        }
    } catch (ClassNotFoundException e) {

        e.printStackTrace();
    } catch (IOException e) {

        e.printStackTrace();
    }

    // storing array list in an array list for future uses

    Vector<String> columnNames = new Vector<String>();

    columnNames.add("Description");
    columnNames.add("Prescription");
    columnNames.add("Medication Type");
    columnNames.add("Dosage");
    columnNames.add("Checked");

    Vector<Vector<Object>> data = new Vector<Vector<Object>>();





    for(int k=0;k<DosageList.size();k++){
        Vector<Object> vector = new Vector<Object>();
        vector.add(DosageList.get(k).getMedDescrip());
        vector.add(DosageList.get(k).getMedPrescrip());
        vector.add(DosageList.get(k).getMedType());
        vector.add(DosageList.get(k).getMedDosage());

        data.add(vector);
    }


    DefaultTableModel dtm = new DefaultTableModel(data, columnNames) {
        private static final long serialVersionUID = 4234183862785566645L;

        @Override
        public boolean isCellEditable(int rowIndex, int columnIndex) {
            return !( rowIndex == 1 && columnIndex == 1 );
        }


    };
    return dtm;
}


// Debug-able main method
public static void main(String[] args) throws SQLException {
    ArrayList<String> nameList= new ArrayList<String>();
    nameList.add("Lee Ching Chong");
    nameList.add("Lim Kuay Siak");
    nameList.add("Lee Ching Chong");

    toDoTable =new JTable(getElderlyFromQueryDos("morning",nameList.get(0)));


    String[] values = new String[] { "Not Feed", "Feed" };
    TableColumn col = toDoTable.getColumnModel().getColumn(4);
    col.setCellEditor(new MyComboBoxEditor(values));
    col.setCellRenderer(new MyComboBoxRenderer(values));

    jpane = new JScrollPane(toDoTable);
    JPanel panel = new JPanel();
    JFrame frame = new JFrame();
    frame.setBounds(0, 0, 700, 543);
    panel.add(jpane);
    frame.getContentPane().add(new JScrollPane(panel));

    JButton btnNext = new JButton("Next");
    panel.add(btnNext);
    frame.setVisible(true);
    btnNext.addActionListener(new ActionListener() {

        public void actionPerformed(ActionEvent e) {
            try {
                toDoTable.setModel(DosageTableHelper.getElderlyFromQueryDos("morning",nameList.get(counter)));
                String[] values = new String[] { "Not Feed", "Feed" };
                TableColumn col = toDoTable.getColumnModel().getColumn(4);
                col.setCellEditor(new MyComboBoxEditor(values));
                col.setCellRenderer(new MyComboBoxRenderer(values));
            } catch (SQLException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }



            counter++;

        }

    });

}



}
@SuppressWarnings("rawtypes")
class MyComboBoxRenderer extends JComboBox implements TableCellRenderer {

private static final long serialVersionUID = 1319299961084034009L;

@SuppressWarnings("unchecked")
public MyComboBoxRenderer(String[] items) {
    super(items);
}

public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
        boolean hasFocus, int row, int column) {
    if (isSelected) {
        setForeground(table.getSelectionForeground());
        super.setBackground(table.getSelectionBackground());
    } else {
        setForeground(table.getForeground());
        setBackground(table.getBackground());
    }
    setSelectedItem(value);
    return this;
}
}
class MyComboBoxEditor extends DefaultCellEditor {

private static final long serialVersionUID = -1702063500403826596L;

@SuppressWarnings({ "rawtypes", "unchecked" })
public MyComboBoxEditor(String[] items) {
    super(new JComboBox(items));
}
}

示例输出：

Answer 1

阅读 Oracle 教程 - How to use tables - part about to use JComboBox as TableCellEditor、
- 说明 JTable 有两个独立的功能 TableCellEditor 用于编辑存储在 XxxTableModel 中的值和 TableCellRenderer 用于绘制存储在 XxxTableModel 中的值，
- 编辑你（事件，API 中实现的通知程序）后，只需使用 [=18 将所选值从 TableCellEditor（JComboBox）存储到 XxxTableModel =]，存储 "feed" 或 "not feed"，而不是 JComboBox 作为 Object，TableCellRenderer 只是从模型绘制到视图
- 默认情况下，一切都通过使用 DefaultTableModel 自动运行，然后需要覆盖减少数量的方法（getColumnClass、isCellEditeble，在你的情况下 setValueAt 可能也是）
有两种方法（第一种需要覆盖XxxTableModel.setValueAt）
- JButton 将被禁用（以编程方式），直到所有值将从空白更改为 "feed" 或 "not feed"，需要在模型内部循环，注意执行代码行 super.setValueAt() 后，编辑器中的值将存储到模型中
- 来自 JButton 的动作在模型内部循环（原始，最简单，但最有效的验证，简单直接的代码，XxxTableModel.setValueAt 内部没有错误）
需要覆盖 XxxTableModel.setValueAt 并设置、更改 isCellEditable(row, column) 以更正值，需要为 isCellEditable 创建单独的数组，仅用于模型事件，不要从外部改变这个数组，只是方法 XxxTableModel.setValueAt 可以通知

如果可能，请使用 DefaultTableModel（以避免在覆盖 AbstractTableModel、方法、侦听器，尤其是模型通知程序所需的代码中出现任何错误解释 - fireXxxXxx )
模型内部的代码排序很重要，首先要将值存储到模型，然后调用任何更改、验证、附加代码，只需基于模型中存储的值的代码
我敢肯定每三点都在这里几次，包括SSCCE/MCVE形式的工作代码示例

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