java - 接受不带小数点的货币格式的 JFormattedTextField

Question

如何编写 JFormattedTextField 代码以接受不带小数的货币格式？

我尝试到处寻找答案。具体来说，是 Oracle、Google 和 Code Ranch。

我的问题:如何对格式化文本字段进行编码以接受不带小数的货币格式。文本字段可接受 5 美元到 10,000,000 美元之间的任何值。我希望它在需要时包含“，”。该字段不会用于数学表达式，因此无需将其从字符串转换。

这是我尝试使用的代码。这种格式不允许我在格式化文本字段中输入任何数字。

buildInfo方法

//The buildInfo method will build the info panel
private void buildInfo()
{
    info = new JPanel();
    GridLayout gl = new GridLayout (3,1);
    info.setLayout (gl);

    //Create panel, label, and text area for pledgers name
    p1 = new JPanel();
    p1.setLayout(new FlowLayout(FlowLayout.LEFT));
    label1 = new JLabel ("Pledger's Name:  ");
    p1.add (label1);
    text1 = new JTextField (20);
    p1.add (text1);

    //Create panel, label, and text area for pledge amount
    p2 = new JPanel();
    p2.setLayout(new FlowLayout(FlowLayout.LEFT));
    label2 = new JLabel ("Pledged Amount: ");
    p2.add (label2);
    NumberFormat amount = NumberFormat.getCurrencyInstance(Locale.US);
    amount.setMaximumFractionDigits(0);
    NumberFormatter pAmount = new NumberFormatter(amount);
    pAmount.setMinimum(5.0);
    pAmount.setMaximum(10000000.0);
    pAmount.setAllowsInvalid(false);
    text2 = new JFormattedTextField (pAmount);
    text2.setColumns(12);
    p2.add (text2);

    //Create panel, label, and text area for charity being pledged
    p3 = new JPanel();
    p3.setLayout(new FlowLayout(FlowLayout.LEFT));
    label3 = new JLabel ("Charity Pledged To:");
    p3.add (label3);
    text3 = new JTextField (20);
    p3.add (text3);

    //Add panels to main panel
    add(p1);
    add(p2);
    add(p3);
}

Answer 1

使用

NumberFormat format = NumberFormat.getCurrencyInstance(Locale.US);
format.setMaximumFractionDigits(0);

NumberFormatter formatter = new NumberFormatter(format);
formatter.setMinimum(5.0);
formatter.setMaximum(10000000.0);
formatter.setAllowsInvalid(false);
formatter.setOverwriteMode(true);

JFormattedTextField field = new JFormattedTextField(formatter);
field.setValue(5.0);