JTextField - 数字分隔(ArrayList)

问题描述

有没有办法使用 JTextField 取多个不同的数字?

Is there any way to take several different numbers using JTextField?

例如，给出以下数值:2.0、3.0、4.0.我想分别把它们放到ArrayList中.

For example, following numeric values are given: 2.0, 3.0, 4.0. I would like to put them into ArrayList separately.

如何处理不正确的输入数据才能继续打字?

How to handle incorrect input data ​​in order to continue the typing?

    //in this case the resulst is "arList: 1.92239991"
    textField = new JTextField("1.9, 223, 9991");
    textField.addActionListener(this);
    ArrayList<Double> arList = new ArrayList<>();

    String str = textField.getText();
    String result = str.replaceAll("\\s+","");
    String otherResult = result.replaceAll(",","");
    double d = Double.parseDouble(otherResult);
    System.out.println(d);

    arList.add(d);
    for (Double anArList : arList) {
        System.out.println("arList: " +anArList);
    }

推荐答案

如果数字总是由 分隔， 你可以使用 String#split，它会返回一个值数组.

If the numbers are always separated by , you can use String#split, which will return an array of values.

String str = textField.getText();
String[] parts = str.split(",");

这将返回 , 之间的每个值，包括空格.然后您可以修剪这些结果...

This will return each value between the ,, including the white space. You could then trim these results...

for (int index = 0; index < parts.length; index++) {
    parts[index] = parts[index].trim();
}

现在只包含剩余的文本.如果你必须把它放在一个列表中，你可以使用...

This will now contain just the remaining text. If you must have it in a list you can use...

List<String> values = Arrays.asList(parts);

如果您需要将它作为 Double 的列表，您将需要单独解析每个元素...

If you need it as list of Doubles, you will need to parse each element indiviudally...

List<Double> values = new ArrayList<Double>(parts.length);
for (String value : values) {
    values.add(Double.parseDouble(value));
}

如果任何一个值不是有效的Double，这仍然会抛出解析异常.

This will still throw a parse exception if any one of the values is not a valid Double.

更好的解决方案可能是使用 JFormattedTextField 或 JSpinner 来收集单个值并将每个值一次添加到列表中(可以将它们显示在JList)，这将允许您在输入时验证每个值.

A better solution might be to use a JFormattedTextField or JSpinner to collect the individual value and add each one to a list one at a time (could display them in a JList), this would allow you to validate each value as it is entered.

查看如何使用格式化文本字段、如何使用微调器 和 如何使用列表了解更多详情

Have a look at How to Use Formatted Text Fields, How to Use Spinners and How to Use Lists for more details

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