問題描述

TableColumn<Product, Double> priceCol = new TableColumn<Product,Double>("Price");
priceCol.setCellValueFactory(new PropertyValueFactory<Product, Double>("price"));

如何將此列中的雙精度設置為具有 2 個小數位(因為它們是價格列)?默認情況下它們只顯示 1 個小數位.

How do I format the doubles in this column to have 2 decimal places(Because they are the column for price)?By default they only show 1 decimal place.

推薦答案

使用生成單元格的單元格工廠，該單元格使用貨幣格式化程序來格式化顯示的文本.這意味著價格將被格式化為當前語言環境中的貨幣(即使用當地貨幣符號和適當的小數位數規則等).

Use a cell factory that generates cells that use a currency formatter to format the text that is displayed. This means the price will be formatted as a currency in the current locale (i.e. using the local currency symbol and appropriate rules for number of decimal places, etc.).

NumberFormat currencyFormat = NumberFormat.getCurrencyInstance();
priceCol.setCellFactory(tc -> new TableCell<Product, Double>() {

    @Override
    protected void updateItem(Double price, boolean empty) {
        super.updateItem(price, empty);
        if (empty) {
            setText(null);
        } else {
            setText(currencyFormat.format(price));
        }
    }
});

注意這是除了你已經在使用的cellValueFactory.cellValueFactory 確定單元格中顯示的值；cellFactory 確定定義如何顯示它的單元格.

Note this is in addition to the cellValueFactory you are already using. The cellValueFactory determines the value that is displayed in a cell; the cellFactory determines the cell that defines how to display it.

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