当你的编辑器结束时，表的editingStopped()方法通过收集新值getCellEditorValue()并将其用于setValueAt()模型中。反过来，该模型应 fireTableCellUpdated()调用指定的渲染器。扩展默认值应该足以处理Number格式化。在其他情况下，将渲染器的实例用作编辑器组件可能会很方便；这个例子展示了一个典型的实现。
附录：感谢@mKorbel的有用评论，我更新了示例，以选择要编辑的单元格文本，如@camickr的文章Table Select All Editor中所述。
package overflow;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.MouseEvent;
import java.text.NumberFormat;
import java.util.EventObject;
import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.text.JTextComponent;
/** @see http://stackoverflow.com/a/10067560/230513 */
public class RenderEditNumber extends JPanel {
private NumberFormat nf = NumberFormat.getCurrencyInstance();
public RenderEditNumber() {
DefaultTableModel model = new DefaultTableModel(
new String[]{"Amount"}, 0) {
@Override
public Class<?> getColumnClass(int columnIndex) {
return Double.class;
}
};
for (int i = 0; i < 16; i++) {
model.addRow(new Object[]{Double.valueOf(i)});
}
JTable table = new JTable(model) {
@Override // Always selectAll()
public boolean editCellAt(int row, int column, EventObject e) {
boolean result = super.editCellAt(row, column, e);
final Component editor = getEditorComponent();
if (editor == null || !(editor instanceof JTextComponent)) {
return result;
}
if (e instanceof MouseEvent) {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
((JTextComponent) editor).selectAll();
}
});
} else {
((JTextComponent) editor).selectAll();
}
return result;
}
};
table.setPreferredScrollableViewportSize(new Dimension(123, 123));
table.setDefaultRenderer(Double.class, new CurrencyRenderer(nf));
table.setDefaultEditor(Double.class, new CurrencyEditor(nf));
this.add(new JScrollPane(table));
}
private static class CurrencyRenderer extends DefaultTableCellRenderer {
private NumberFormat formatter;
public CurrencyRenderer(NumberFormat formatter) {
this.formatter = formatter;
this.setHorizontalAlignment(JLabel.RIGHT);
}
@Override
public void setValue(Object value) {
setText((value == null) ? "" : formatter.format(value));
}
}
private static class CurrencyEditor extends DefaultCellEditor {
private NumberFormat formatter;
private JTextField textField;
public CurrencyEditor(NumberFormat formatter) {
super(new JTextField());
this.formatter = formatter;
this.textField = (JTextField) this.getComponent();
textField.setHorizontalAlignment(JTextField.RIGHT);
textField.setBorder(null);
}
@Override
public Object getCellEditorValue() {
try {
return new Double(textField.getText());
} catch (NumberFormatException e) {
return Double.valueOf(0);
}
}
@Override
public Component getTableCellEditorComponent(JTable table,
Object value, boolean isSelected, int row, int column) {
textField.setText((value == null)
? "" : formatter.format((Double) value));
return textField;
}
}
private void display() {
JFrame f = new JFrame("RenderEditNumber");
f.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
new RenderEditNumber().display();
}
});
}
}
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