把JComboBox放到JTable中，並從列表中獲取元素而不是編輯單元格

我想使JTable中的一個單元成爲JComboBox對象並能夠使用它。它必須只有一個單元格，而不是整個列。該表可以包含特定的單元格，但並非總是如此，其放置位置不是靜態的。我的問題在於把JComboBox放入可以使用的JTable中。我附上了我迄今能夠做到的代碼。表包含JComboBox，但是當我點擊它時，沒有列表並打開單元格的編輯器。我想讓名單出現。我應該做什麼或者應該在代碼中添加/修改什麼來實現我的目標？把JComboBox放到JTable中，並從列表中獲取元素而不是編輯單元格

import java.awt.Component; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.JComboBox; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JRootPane; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.table.DefaultTableCellRenderer; 
import javax.swing.table.DefaultTableModel; 
import javax.swing.table.JTableHeader; 
import javax.swing.table.TableColumn; 

public class CustomCellRenderer { 
    JTable table; 
    TableColumn tcol; 

    public static void main(String[] args) { 
     new CustomCellRenderer(); 
    } 

    public CustomCellRenderer() { 
     JFrame frame = new JFrame(); 
     JPanel panel = new JPanel(); 
     Object data[][] = { { "Vinod", "Computer", "3" }, 
       { "Rahul", "History", "2" }, { "Manoj", "Biology", "4" }, 
       { "Sanjay", "PSD", "5" } }; 
     String col[] = { "Name", "Course", "Year" }; 
     DefaultTableModel model = new DefaultTableModel(data, col); 
     table = new JTable(model); 
     tcol = table.getColumnModel().getColumn(0); 
     tcol.setCellRenderer(new CustomTableCellRenderer()); 
     tcol = table.getColumnModel().getColumn(1); 
     tcol.setCellRenderer(new CustomTableCellRenderer()); 
     tcol = table.getColumnModel().getColumn(2); 
     tcol.setCellRenderer(new CustomTableCellRenderer()); 
     JTableHeader header = table.getTableHeader(); 
     JScrollPane pane = new JScrollPane(table); 
     panel.add(pane); 
     frame.add(panel); 
     frame.setSize(500, 150); 
     frame.setUndecorated(true); 
     frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setVisible(true); 
    } 

    public class CustomTableCellRenderer extends DefaultTableCellRenderer implements ActionListener { 
     public Component getTableCellRendererComponent(JTable table, 
       Object obj, boolean isSelected, boolean hasFocus, int row, 
       int column) { 
      Component cell = super.getTableCellRendererComponent(table, obj, 
        isSelected, hasFocus, row, column); 

      if (((String) obj).equals("History")) { 
       JComboBox comboBox = new JComboBox(); 
       comboBox.addItem("History"); 
       comboBox.addItem("English"); 
       comboBox.addItem("Biology"); 
       comboBox.addItem("PE"); 
       comboBox.addItem("None of the above"); 
       comboBox.addActionListener(this); 

       return comboBox; 
      } 
      return cell; 
     } 

     public void actionPerformed(ActionEvent e) { 
      System.out.println("Perform some action"); 
     } 
    } 
}

來源

2012-08-27 dawrutowicz