JTextField特定格式检查 [英] JTextField Specific format checking

问题描述

我想检查输入到我的JTextField1的输入是否等于下面显示的示例图片，该怎么做?

I want to check if the input entered to my JTextField1 equal to shown sample picture below, how to do that?

我只能检查是否通过输入以下代码来输入数字以尝试阻止并捕获NumberFormatException

I can only check if numbers entered by putting below code in to try block and catch NumberFormatException

   try {
       taxratio = new BigDecimal(jTextField1.getText());  }
      } 
         catch (NumberFormatException nfe) {
            System.out.println("Error" + nfe.getMessage());
        }

推荐答案

以下是两个选项:

带有InputVerifier 的JTextField.除非其内容具有指定的格式，否则该文本字段不会产生焦点.

A JTextField with an InputVerifier. The text field will not yield focus unless its contents are of the form specified.

JTextField textField = new JTextField();
textField.setInputVerifier(new InputVerifier() {
    @Override
    public boolean verify(JComponent input) {
        String text = ((JTextField) input).getText();
        if (text.matches("%\\d\\d"))
            return true;
        return false;
    }
});
textField.setText("%  ");

---

带有MaskFormatter 的JFormattedTextField.文本字段将不接受与指定的掩码不符的键入字符.如果希望在没有输入的情况下显示默认数字，则可以将占位符设置为数字.

---

A JFormattedTextField with a MaskFormatter. The text field will not accept typed characters which do not comply with the mask specified. You ca set the placeholder character to a digit if you want a default number to appear when there is no input.

MaskFormatter mask = new MaskFormatter("%##");
mask.setPlaceholderCharacter(' '); 
JFormattedTextField textField2 = new JFormattedTextField(mask);

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