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我有一個相當複雜的JTable，我正在研究。行和列的數量由列表構成。然後取決於單元格編輯器需要更改的行的哪一列。當我尋找一個解決方案的goggling時，我發現這個： http://www.java2s.com/Code/Java/Swing-Components/EachRowwithdifferentEditorExample.htm自定義TableCellEditor只適用於1 Column Dispite應用於所有
我把那個代碼變成了原樣並運行它，以確保它能夠工作在當前的Java版本中。所以我將它工作到了我已經構建的JTable中，但似乎正在發生的事情是，當我將它應用於多個列時，它最終只能爲第一列工作。
我整理了一段完全可執行的代碼段，我已經評論並設置了模擬我的數據庫數據。代碼是相當體面的評論，所以應該很容易遵循。這個例子至少對我來說仍然會產生問題。
如果您有任何人可以看到最新的錯誤，我將非常感謝幫助。
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class EachRowEditorExample extends JFrame {
public EachRowEditorExample() {
super("EachRow Editor Example");
List<Membership> _Memberships = new ArrayList<Membership>();
DefaultTableModel DataModel;
//Lets Start by simluating the data.
for (int z = -2; z < 10; z++)
{
Membership m = new Membership();
m.setId(z);
if (z == -2)
{
m.setMembership("Employee");
m.setEft(false);
}
else if (z == -1)
{
m.setMembership("NONE");
m.setEft(false);
}
else
{
m.setMembership("Membership " + z);
if (z < 3)
m.setEft(true);
else
m.setEft(false);
}
_Memberships.add(m);
}
//*******************************************************
// Starts Copy and paste from Program
//*******************************************************
//lets build our Data Model
int size = _Memberships.size();
Object[][] rows = new Object[size][];
String[] cols = new String[size];
int x = 0;
for(Iterator<Membership> i = _Memberships.iterator(); i.hasNext();)
{
Membership side = i.next();
cols[x] = side.getMembership();
Object[] row = new Object[size];
int b = 0;
for(Iterator<Membership> j = _Memberships.iterator(); j.hasNext();)
{
Membership top = j.next();
if (side.getId() == top.getId() && (side.isEft() && top.isEft()))
{
row[b] = null;
}
else
row[b] = NUHPADX(side.getId(), top.getId());
b++;
}
rows[x] = row;
x++;
}
DataModel = new DefaultTableModel(rows,cols);
//Now Lets create our JTable and configure it.
JTable table = new JTable(DataModel) {
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
Object t = getValueAt(rowIndex, rowIndex);
if (t == null)
return false;
else
return true;
}
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column)
{
Component c = super.prepareRenderer(renderer, row, column);
Object t = getValueAt(row, column);
if (t == null)
{
c.setBackground(Color.black);
}
else
{
Color PRIMARY_ROW_COLOR = Color.white;
Color ALTERNATE_ROW_COLOR = new Color(0xA9F1ED);
//even index, selected or not selected
if (row % 2 == 0)
{
if (column % 2 == 0)
c.setBackground(PRIMARY_ROW_COLOR.darker());
else
c.setBackground(PRIMARY_ROW_COLOR);
}
else
{
if (column % 2 == 0)
c.setBackground(ALTERNATE_ROW_COLOR.darker());
else
c.setBackground(ALTERNATE_ROW_COLOR);
}
}
return c;
}
};
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.getTableHeader().setReorderingAllowed(false);
JList rowHeader = new JList(cols);
rowHeader.setCellRenderer(new RowHeaderRenderer(table));
//Lets Place the new table in a Scroll Pane Since there could be alot of data.
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setRowHeaderView(rowHeader);
getContentPane().add(scrollPane, BorderLayout.CENTER);
//Now lets Build the Cell Editors
int c = 0;
int r = 0;
for(Iterator<Membership> a = _Memberships.iterator(); a.hasNext();)
{
Membership top = a.next();
EachRowEditor rowEditor = new EachRowEditor(table);
for(Iterator<Membership> b = _Memberships.iterator(); b.hasNext();)
{
Membership side = b.next();
if (side.getId() == top.getId() && (side.isEft() && top.isEft()))
{
//rowEditor.setEditorAt(r, null);
}
else if (side.getId() != top.getId() && (side.isEft() && top.isEft()))
{
NuhpadxCell t = new NuhpadxCell(side, top, new DefaultComboBoxModel(new String[] {"N", "U", "D", "A"}));
t.setSelectedItem(NUHPADX(side.getId(), top.getId()));
rowEditor.setEditorAt(r, new DefaultCellEditor(t));
}
else
{
NuhpadxCell t = new NuhpadxCell(side, top, new DefaultComboBoxModel(new String[] {"N", "A", "H", "X", "P"}));
t.setSelectedItem(NUHPADX(side.getId(), top.getId()));
rowEditor.setEditorAt(r, new DefaultCellEditor(t));
}
r++;
}
table.getColumn(top.getMembership()).setCellEditor(rowEditor);
table.revalidate();
c++;
}
table.removeColumn(table.getColumn("NONE"));
//*******************************************************
// Ends Copy and paste from Program
//*******************************************************
setSize(1060, 600);
setVisible(true);
}
//This function jsut simluates a entire class
public String NUHPADX(int side, int top)
{
Random generator = new Random();
int roll = generator.nextInt(7);
switch (roll)
{
case 0:
return "N";
case 1:
return "U";
case 2:
return "H";
case 3:
return "P";
case 4:
return "A";
case 5:
return "P";
case 6:
return "A";
default:
return "N";
}
}
public static void main(String[] args) {
EachRowEditorExample frame = new EachRowEditorExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
//Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
/* (swing1.1.1) */
class EachRowEditor implements TableCellEditor {
protected Hashtable editors;
protected TableCellEditor editor, defaultEditor;
JTable table;
/**
* Constructs a EachRowEditor. create default editor
*
* @see TableCellEditor
* @see DefaultCellEditor
*/
public EachRowEditor(JTable table) {
this.table = table;
editors = new Hashtable();
defaultEditor = new DefaultCellEditor(new JTextField());
}
/**
* @param row
* table row
* @param editor
* table cell editor
*/
public void setEditorAt(int row, TableCellEditor editor) {
editors.put(new Integer(row), editor);
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
editor = (TableCellEditor) editors.get(new Integer(row));
if (editor == null) {
editor = defaultEditor;
}
return editor.getTableCellEditorComponent(table, value, isSelected, row, column);
}
public Object getCellEditorValue() {
return editor.getCellEditorValue();
}
public boolean stopCellEditing() {
return editor.stopCellEditing();
}
public void cancelCellEditing() {
editor.cancelCellEditing();
}
public boolean isCellEditable(EventObject anEvent) {
selectEditor((MouseEvent) anEvent);
return editor.isCellEditable(anEvent);
}
public void addCellEditorListener(CellEditorListener l) {
editor.addCellEditorListener(l);
}
public void removeCellEditorListener(CellEditorListener l) {
editor.removeCellEditorListener(l);
}
public boolean shouldSelectCell(EventObject anEvent) {
selectEditor((MouseEvent) anEvent);
return editor.shouldSelectCell(anEvent);
}
protected void selectEditor(MouseEvent e) {
int row;
if (e == null) {
row = table.getSelectionModel().getAnchorSelectionIndex();
} else {
row = table.rowAtPoint(e.getPoint());
}
editor = (TableCellEditor)editors.get(new Integer(row));
if (editor == null) {
editor = defaultEditor;
}
}
}
//*******************************************************
// Starts Copy and paste from Program
//*******************************************************
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
private static final long serialVersionUID = 4619707414623897299L;
public RowHeaderRenderer(JTable table) {
JTableHeader header = table.getTableHeader();
setOpaque(true);
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
setHorizontalAlignment(CENTER);
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
setText((value == null) ? "" : value.toString());
return this;
}
}
class NuhpadxCell extends JComboBox {
private static final long serialVersionUID = -4464709511574911230L;
private Membership _side;
private Membership _top;
public NuhpadxCell(Membership s, Membership t, DefaultComboBoxModel aModel)
{
_side = s;
_top = t;
addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
DoUpdate();
}
});
setModel(aModel);
}
private void DoUpdate() {
// I would then update my database useing the ID of the side and top memberships as keys.
}
}
//*******************************************************
// Ends Copy and paste from Program
//*******************************************************
//A bare Skeleton of the membership class needed to run this code.
class Membership {
protected int id;
protected String membership;
protected boolean eft;
public int getId() {
return id;
}
public void setId(int value) {
this.id = value;
}
public String getMembership() {
return membership;
}
public void setMembership(String value) {
this.membership = value;
}
public boolean isEft() {
return eft;
}
public void setEft(boolean value) {
this.eft = value;
}
}
是你的意思嗎？線程中的異常「AWT-EventQueue-0」java.lang.Nul lPointerException'from codel line'return editor.isCellEditable（anEvent）;' – mKorbel