JTable not rendering JCheckBox or JComboBox in the table in Java Applet

问题

Im having trouble getting my JTable that im using to display either check boxes or combo boxes in my applet.

Here is the code that is not working correctly

 String[] options = {"download", "ignore"};
 Object[] obj = {new JComboBox(options), ((MetadataList)array.get(1)).getMetadata("Filename").getValue()};

 defaultTableModel2.addRow(obj);

The defaultTableModel2 is simply a DefaultTableModel defaultTabelModel2 = new DefaultTableModel() so nothing too dramatic there. The code above is using a JComboBox, but I have also tried using a JCheckBox as well and the same issues were present.

javax.swing.JComboBox[,0,0,0x0,invalid,layout=javax.swing.plaf.basic.BasicComboBoxUI$Handler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.synth.SynthBorder@8380df,flags=320,maximumSize=,minimumSize=,preferredSize=,isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemReminder=download]

is what appears instead of a JComboBox

Any help would be greatly appreciated!

回答1:

For example:

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

@SuppressWarnings("serial")
public class TableJunk extends JPanel {
   enum Day {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY}
   MyTableModel tableModel = new MyTableModel();
   private JTable myTable = new JTable(tableModel);

   public TableJunk() {
      setLayout(new BorderLayout());
      add(new JScrollPane(myTable));

      Object[] rowData = {Day.MONDAY, Boolean.TRUE};
      tableModel.addRow(rowData );
      rowData = new Object[]{Day.TUESDAY, Boolean.TRUE};
      tableModel.addRow(rowData );
      rowData = new Object[]{Day.WEDNESDAY, Boolean.TRUE};
      tableModel.addRow(rowData );
      rowData = new Object[]{Day.THURSDAY, Boolean.TRUE};
      tableModel.addRow(rowData );
      rowData = new Object[]{Day.FRIDAY, Boolean.TRUE};
      tableModel.addRow(rowData );
      rowData = new Object[]{Day.SATURDAY, Boolean.FALSE};
      tableModel.addRow(rowData );
      rowData = new Object[]{Day.SUNDAY, Boolean.FALSE};
      tableModel.addRow(rowData );

      // create the combo box for the column editor          
      JComboBox<Day> comboBox = new JComboBox<TableJunk.Day>(Day.values());
      myTable.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(comboBox));
   }

   private static void createAndShowGui() {
      TableJunk mainPanel = new TableJunk();

      JFrame frame = new JFrame("TableJunk");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }


   private static class MyTableModel extends DefaultTableModel {
      private static final String[] COLUMN_NAMES = {"Day", "Work Day"};

      public MyTableModel() {
         super(COLUMN_NAMES, 0);
      }

      // this method will allow the check box to be rendered in the 2nd column
      public java.lang.Class<?> getColumnClass(int columnIndex) {
         if (columnIndex == 0) {
            return Day.class;
         } else if (columnIndex == 1) {
            return Boolean.class;
         } else {
            return super.getColumnClass(columnIndex);
         }
      };
   }
}

来源：https://stackoverflow.com/questions/11255516/jtable-not-rendering-jcheckbox-or-jcombobox-in-the-table-in-java-applet

标签

java

swing

jtable

jcombobox

japplet