try{
   TableColumn column = jTable.getColumn(colName);
   column.setCellEditor(new DefaultCellEditor(new JComboBox()));
 }catch(IllegalArgumentException ex){
 }
 或者
TableColumn column = JTable.getColumnModel().getColumn(int column);
column.setCellEditor(new DefaultCellEditor(new JComboBox()));

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

import javax.swing.JComboBox;
import javax.swing.JTable;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.EventListenerList;
import javax.swing.table.TableCellEditor;

public class ComboBoxCellEditor extends JComboBox implements TableCellEditor{

    protected EventListenerList listenerList = new EventListenerList();
    protected ChangeEvent changeEvent = new ChangeEvent(this);
    
    public ComboBoxCellEditor() {
        super();
        
        addItem("日");
        addItem("月");
        addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                fireEditingStopped();
            }
        });
    }

    public void addCellEditorListener(CellEditorListener listener) {
        listenerList.add(CellEditorListener.class, listener);
    }

    public void removeCellEditorListener(CellEditorListener listener) {
        listenerList.remove(CellEditorListener.class, listener);
    }

    protected void fireEditingStopped() {
        CellEditorListener listener;
        Object[] listeners = listenerList.getListenerList();
        for (int i = 0; i < listeners.length; i++) {
            if (listeners[i] == CellEditorListener.class) {
                listener = (CellEditorListener) listeners[i + 1];
                listener.editingStopped(changeEvent);
            }
        }
    }

    protected void fireEditingCanceled() {
        CellEditorListener listener;
        Object[] listeners = listenerList.getListenerList();
        for (int i = 0; i < listeners.length; i++) {
            if (listeners[i] == CellEditorListener.class) {
                listener = (CellEditorListener) listeners[i + 1];
                listener.editingCanceled(changeEvent);
            }
        }
    }

    public void cancelCellEditing() {
        fireEditingCanceled();
    }

    public boolean stopCellEditing() {
        fireEditingStopped();
        return true;
    }

    public boolean isCellEditable(EventObject event) {
        return true;
    }

    public boolean shouldSelectCell(EventObject event) {
        return true;
    }

    public Object getCellEditorValue() {
        return getSelectedItem();
    }

    public Component getTableCellEditorComponent(JTable table, Object value,
            boolean isSelected, int row, int column) {
        return this;
    }
}

JTable table = new JTable(){                
    @Override
    public TableCellEditor getCellEditor(int row, int column) {
        // TODO Auto-generated method stub
        if(row ==1 && column == 2){
            return new ComboBoxCellEditor();
        }
        return super.getCellEditor(row, column);
    }
};