将 JComboBox 添加到 JTable 单元格 [重复]

Question

可能重复：
How to add a JComboBox to a JTable cell?

我发现很难将JComboBox 添加到JTable 的单元格之一，我尝试了下面的代码，但它不起作用..

如何将 jcombobox 添加到特定单元格？

按下enter 时，一个新的jcombobox 应该会自动添加到所需的列中。

jTable1 = new javax.swing.JTable();
mod=new DefaultTableModel();
mod.addColumn("No");
mod.addColumn("Item ID");
mod.addColumn("Units");
mod.addColumn("Amount");
mod.addColumn("UOM");
mod.addColumn("Delivery Date");
mod.addColumn("Total Amount");
mod.addColumn("Notes");
mod.addColumn("Received");
mod.addRow(new Object [][] {
        {1, null, null, null, null, null, null, null, null}
    });
jTable1.setModel(mod);
jTable1.getColumnModel().getColumn(1).setCellEditor(new DefaultCellEditor(generateBox()));
jTable1.setColumnSelectionAllowed(true);


Code to generate ComboBox

private JComboBox generateBox()
 {
     JComboBox bx=null;
     Connection con=CPool.getConnection();
     try
     {
         Statement st=con.createStatement();
         String query="select distinct inid from inventory where company_code="+"'"+ims.MainWindow.cc+"'";
         ResultSet rs=st.executeQuery(query);
         bx=new JComboBox();
         while(rs.next()){
             bx.addItem(rs.getString(1));
         }
         CPool.closeConnection(con);
         CPool.closeStatement(st);
         CPool.closeResultSet(rs);
     }catch(Exception x)
     {
         System.out.println(x.getMessage());
     }
             return bx;

 }

Answer 1

看看这个链接会对你有帮助

http://docs.oracle.com/javase/tutorial/uiswing/components/table.html

和代码：

http://docs.oracle.com/javase/tutorial/uiswing/examples/components/TableRenderDemoProject/src/components/TableRenderDemo.java

Answer 2

JComboBox 通过扩展 DefaultCellEditor 添加到 JTable

示例：

TableColumn comboCol1 = table.getColumnModel().getColumn(0);
comboCol1.setCellEditor(new CustomComboBoxEditor());

/**
   Custom class for adding elements in the JComboBox.
*/
public class CustomComboBoxEditor extends DefaultCellEditor {

  // Declare a model that is used for adding the elements to the `Combo box`
  private DefaultComboBoxModel model;

  public CustomComboBoxEditor() {
      super(new JComboBox());
      this.model = (DefaultComboBoxModel)((JComboBox)getComponent()).getModel();
  }

  @Override
  public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
      // Add the elements which you want to the model.
      // Here I am adding elements from the orderList(say) which you can pass via constructor to this class.
      model.addElement(orderList.get(i));

      //finally return the component.
      return super.getTableCellEditorComponent(table, value, isSelected, row, column);
  } 
}

通过使用自定义类在 JTable 中创建组件，您可以拥有 更好地控制您正在展示的内容。