如何存储在表中的舍入值,而不是将它们显示为圆形
-
26-12-2019 - |
题
我有一个表,我需要将数字舍入到4个小数点。我已经设法这样做,但问题是,当表正在显示舍入值时,存储的实际值不是舍入的值(我使用BigDecimal,因为我希望能够控制单元格的舍入行为)。当我打印单元格值时,即使表中显示的值是舍入值,我会获得具有超过4个十进制值的数字。我写了自己的编辑和渲染器,如下所示:
class DoubleEditor4 extends DefaultCellEditor {
public DoubleEditor4() {
super(new JFormattedTextField());
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
JFormattedTextField editor = (JFormattedTextField) super.getTableCellEditorComponent(table, value, isSelected, row, column);
if (value!=null){
String num = (String) value;
BigDecimal num2 = new BigDecimal(num).setScale(4, BigDecimal.ROUND_HALF_UP);
String text = num2.toString();
editor.setHorizontalAlignment(SwingConstants.RIGHT);
editor.setText(text);
}
return editor;
}
}
class DoubleRenderer4 extends DefaultTableCellRenderer {
public DoubleRenderer4() {
super();
this.setHorizontalAlignment(SwingConstants.RIGHT);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
value = new BigDecimal(value.toString()).setScale(4, BigDecimal.ROUND_HALF_UP);
return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column );
}
public void setValue(Object value) {
BigDecimal num2 = new BigDecimal(value.toString()).setScale(4, BigDecimal.ROUND_HALF_UP);
String text = num2.toString();
setText(text);
}
}
.
我做错了什么,这样表模型中的存储值不是舍入的值?谢谢。
解决方案
我通过覆盖小区编辑器类中的getcelleditorValue()方法而这样解决:
@Override
public Object getCellEditorValue() {
Object v = super.getCellEditorValue();
BigDecimal n = new BigDecimal(v.toString()).setScale(4, BigDecimal.ROUND_HALF_UP);
return n.toString();
}
. 不隶属于 StackOverflow