[FIXED] TableView column data set to 2 decimal places

Issue

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; 
}

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

I sent contents of TextField named txtPovrsina to double variable:

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

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));

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.

I tried:

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));

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

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.

Can anyone give me some direction please?

Solution

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()));
        }
    }
});

Answered By - James_D
Answer Checked By - Robin (JavaFixing Admin)