在TableView中显示DoubleProperty最多两个小数位 [英] Showing DoubleProperty up to two decimal places in TableView

问题描述

我遇到问题，直到第二个小数点才显示doubleProperty。

I'm having a problem showing a doubleProperty up until the second decimal.

粗略的布局如下所示：

public static void main(String[] args) {
    private TableView<myType> myTable;
    private TableColumn<myType, Double> myCol;

public class myObject {
    .....
    DoubleProperty myDouble;
    ....

    public doubleProperty getPropertyMyDouble() {
        return myDouble;
    }

    public void setMyDouble(double d) {
        myDouble.set(d)
    }
}

我在列中填写：

   ...
   myCol.setCellValueFactory(cellData ->cellData.getValue().getPropertyMyDouble().asObject());
   ...

现在我的问题是：如果我离开 setMyDouble 方法， myCol 包含
多个小数的数字。我只想要小数点后两位。

Now my problem is this: If I leave the setMyDouble method the way it is, myCol is full of numbers with lots of decimals. I only want up to the second decimal.

我尝试做的是这样的：

public void setMyDouble(double d) {
        BigDecimal bd = new SimpleDecimalFormat("#.00")
        myDouble.set(Double.parseDouble(bd.format(d));
    }

现在这适用于删除第二个小数后的数字，但问题是如果我有一些
像12.00，因为我需要在最后转换为一个双倍（因为 .set（）需要一倍）它变成12.00
到12.0。但是，我需要一直保留两位小数。

Now this works in removing digits after the second decimal, but the problem is that if I have something like 12.00, because I need to convert to a double at the end (Since .set() takes a double) it turns 12.00 into a 12.0. However, I need to keep two decimal places all the time.

有没有办法保留 myDouble 作为 DoubleProperty （我这样做是因为它使更改后的表自动更新表）
但是显示数据在＃。##格式？

Is there any way to keep myDouble as a DoubleProperty (I'm doing this because it makes updating the table automatically after changes much easier) but present the data as in the "#.##" format?

我在考虑做一些像添加实例变量的事情：

I was thinking maybe doing something like adding an instance variable:

StringProperty myDoublePresent;

只需 myDouble 然后转过来到一个字符串，然后出现在＃。##格式。

which would just take myDouble and turn it into a string and then present in the "#.##" format.

但我更喜欢方法，我可以直接使用 DoubleProperty。

But I'd prefer a method where I can work directly with the DoubleProperty.

推荐答案

尝试

myCol.setCellValueFactory(cellData ->
     Bindings.format("%.2f", cellData.getValue().getPropertyMyDouble()));

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