如何将JComboBox添加到JTable中的特定单元格

Question

我只想在选择表格中的特定单元格时将defaultCellEditor更改为JComboBox。

Answer 1

只需让您的TableModel从该单元格的isCellEditable()返回true即可。

Answer 2

重写JTable的getCellEditor（...）方法以返回相应的编辑器。例如：

import java.awt.*; 
import java.awt.event.*; 
import java.util.List; 
import java.util.ArrayList; 
import javax.swing.*; 
import javax.swing.table.*; 

public class TableComboBoxByRow extends JFrame 
{ 
    List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3); 

    public TableComboBoxByRow() 
    { 
     // Create the editors to be used for each row 

     String[] items1 = { "Red", "Blue", "Green" }; 
     JComboBox comboBox1 = new JComboBox(items1); 
     DefaultCellEditor dce1 = new DefaultCellEditor(comboBox1); 
     editors.add(dce1); 

     String[] items2 = { "Circle", "Square", "Triangle" }; 
     JComboBox comboBox2 = new JComboBox(items2); 
     DefaultCellEditor dce2 = new DefaultCellEditor(comboBox2); 
     editors.add(dce2); 

     String[] items3 = { "Apple", "Orange", "Banana" }; 
     JComboBox comboBox3 = new JComboBox(items3); 
     DefaultCellEditor dce3 = new DefaultCellEditor(comboBox3); 
     editors.add(dce3); 

     // Create the table with default data 

     Object[][] data = 
     { 
      {"Color", "Red"}, 
      {"Shape", "Square"}, 
      {"Fruit", "Banana"}, 
      {"Plain", "Text"} 
     }; 
     String[] columnNames = {"Type","Value"}; 
     DefaultTableModel model = new DefaultTableModel(data, columnNames); 
     JTable table = new JTable(model) 
     { 
      // Determine editor to be used by row 
      public TableCellEditor getCellEditor(int row, int column) 
      { 
       int modelColumn = convertColumnIndexToModel(column); 

       if (modelColumn == 1 && row < 3) 
        return editors.get(row); 
//     return (TableCellEditor)editors.get(row); 
       else 
        return super.getCellEditor(row, column); 
      } 
     }; 
     System.out.println(table.getCellEditor()); 

     JScrollPane scrollPane = new JScrollPane(table); 
     getContentPane().add(scrollPane); 
    } 

    public static void main(String[] args) 
    { 
     TableComboBoxByRow frame = new TableComboBoxByRow(); 
     frame.setDefaultCloseOperation(EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setVisible(true); 
    } 
} 

Answer 3

如果您使用netbeans，请在执行的jbutton操作下键入此代码。

你应该有jtable和jcombobox几个项目。试试这个单一的代码：

jTable1.getColumnModel().getColumn(2).setCellEditor(new DefaultCellEditor(jComboBox1));