在 JTable 中编辑单元格值时,它的值突然以指数形式出现(即 1.7E10),而不是以正常的用户友好形式显示。
如何在编辑单元格值时更改数字格式?
...
解决方案非常简单,必须像那样创建我自己的 TableCellEditor:
public static class Double2DecimalEditor extends AbstractCellEditor implements TableCellEditor{
private static final long serialVersionUID = 1L;
private JComponent component = new JTextField();
private NumberFormat nf;
@Override
public Object getCellEditorValue() {
System.out.println("getCellEditorValue");
NumberFormat nf = new DecimalFormat("#,###.###");
String text = ((JTextField)component).getText();
System.out.println("TEXT = " + ((JTextField)component).getText());
return nf.format(Double.parseDouble(text));
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
System.out.println("getCellEditorComponent");
Double data = Double.valueOf(value.toString().replace(",", ""));
NumberFormat nf = new DecimalFormat("#.###");
((JTextField)component).setText(nf.format(data));
((JTextField)component).setHorizontalAlignment(SwingConstants.RIGHT);
return component;
}
}
感谢大家的建议!
最佳答案
据我所知,这一行破坏了您的代码
textField.setText((value != null) ? value.toString() : "");
这发生在 JTable 使用的 javax.swing.DefaultCellEditor#DefaultCellEditor 中。
您必须添加自己的应用格式的编辑器。
应该也差不多
table.setDefaultEditor(Double.class, new DefaultCellEditor(new JTextField())
{
public Component getTableCellEditorComponent( JTable table, Object value,
boolean isSelected,
int row, int column )
{
String formattedvalue = formatyourvalue(value);
delegate.setValue(formattedvalue);
return editorComponent;
}
});
应用于您更改 makeTable 的示例
private static JTable makeSampleTable()
{
String[] columnNames = {"String", "Integer", "Boolean", "Double"};
Object[][] data = {{"AAA", 12, true, 111111111111.15},
{"BBB", 1, false, 11199999111.15}, {"CCC", 2, true, 1155555511111.15},};
DefaultTableModel m = new DefaultTableModel(data, columnNames)
{
private static final long serialVersionUID = 1L;
@Override
public Class<?> getColumnClass( int column )
{
return getValueAt(0, column).getClass();
}
};
JTable table = new JTable(m);
TableColumnModel tm = table.getColumnModel();
tm.getColumn(3).setCellRenderer(new Double2DecimalRenderer());
table.setDefaultEditor(Double.class, new DefaultCellEditor(new JTextField())
{
public Component getTableCellEditorComponent( JTable table, Object value,
boolean isSelected,
int row, int column )
{
NumberFormat nf;
nf = NumberFormat.getNumberInstance();
nf.setMinimumFractionDigits(2);
nf.setMaximumFractionDigits(2);
if ( ( value != null ) && ( value instanceof Number ) )
{
Number numberValue = (Number) value;
delegate.setValue(nf.format(numberValue.doubleValue()));
}
else
{
delegate.setValue(value);
}
return editorComponent;
}
});
return table;
}
关于java - 编辑单元格值时以十进制格式显示数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8654449/