TableView 列数据设置为 2 位小数 [英] TableView column data set to 2 decimal places

问题描述

我有 1 个类文件 Nepokretnost.java，其中的构造函数如下所示:

I have 1 class file Nepokretnost.java in which constructor look like this:

public Nepokretnost(String tipNepokretnosti, String zona, String pravo, 
        double povrsina, int amortizacija, double osnovica, double kredit, double porez) {
    this.tipNepokretnosti = tipNepokretnosti;
    this.zona = zona;
    this.pravo = pravo;
    this.povrsina = povrsina;
    this.amortizacija = amortizacija;
    this.osnovica = osnovica;
    this.kredit = kredit;
    this.porez = porez; 
}

此外，我有每个类字段的列的 TableView.我的问题是双字段povrsina".我想从 TextField 设置它.

Further, I have TableView with column for each of class fields. My problem is double field "povrsina". I want to set it from TextField.

我将名为 txtPovrsina 的 TextField 内容发送到双变量:

I sent contents of TextField named txtPovrsina to double variable:

double dPovrsina;
dPovrsina = Double.parseDouble(txtPovrsina.getText());

然后将所有字段放入TableView:

then put all fields in TableView:

ObservableList<Nepokretnost> data = tblTabela.getItems();
    data.add(new Nepokretnost(cboNepokretnost.getValue().toString(),cboZona.getValue().toString(),
            txtPravo,dPovrsina,40,450000.25,2500.00,2500.00));

一切正常，但我想要一些应用程序的行为，我不知道如何设置.现在，当我将像 25 这样的 int 放入 TextField 时，我在 TableView 列中得到 25.0.我希望所有列单元格都恰好有 2 个小数位.

All is working well, but I want some behavior of app I can't figure out how to set. Right now when I put int like 25 in TextField I get 25.0 in TableView column. I want all column cells to have exactly 2 decimal places.

我试过了:

DecimalFormat df=new DecimalFormat("#.00");
ObservableList<Nepokretnost> data = tblTabela.getItems();
    data.add(new Nepokretnost(cboNepokretnost.getValue().toString(),cboZona.getValue().toString(),
            txtPravo,df.format(dPovrsina),40,450000.25,2500.00,2500.00));

但我收到错误不兼容的类型:字符串无法转换为双精度"

but I get error "Incompatible types: String cannot be converted to double"

我仍然是 Java 中的菜鸟，但我的猜测是格式正在制作字符串，我想输入保持双精度只是为了有 2 个小数位.像本专栏一样，其他双字段也会有同样的问题.

I am still noob in java but my guess is format is making String and I want to input stay double just to have 2 decimal places. Like this column I will have same issue with other double fields.

谁能给我一些指导?

推荐答案

您希望更改数据在表格中的显示方式，而不是更改数据本身.为此，您需要在表格列上设置一个单元工厂.类似的东西

You want to change the way the data is displayed in your table, not change the data itself. To do that, you need to set a cell factory on your table column. Something like

TableView<Nepokretnost> table = new TableView<>();
TableColumn<Nepokretnost, Number> povrsinaCol = new TableColumn<>("Povrsina");
povrsinaCol.setCellValueFactory(cellData -> 
    new ReadOnlyDoubleWrapper(cellData.getValue().getPovrsina()));

povrsinaCol.setCellFactory(tc -> new TableCell<Nepokretnost, Number>() {
    @Override
    protected void updateItem(Number value, boolean empty) {
        super.updateItem(value, empty) ;
        if (empty) {
            setText(null);
        } else {
            setText(String.format("%0.2f", value.doubleValue()));
        }
    }
});

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