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What is a simple way to create a text field (or such) that only allows the user to enter ints/doubles in Java?

I am looking for a way to ensure that my text field (JTextField, JFormattedTextField) is returning a double or int rather than a string when I call .getText(). What is the best way to do this (if possible)?

Thanks!

开发者_如何学Go

badPanda :D


  1. Register InputVerifier and call method getValue from JFormattedTextField

    public class FormattedTextFieldVerifier extends InputVerifier {
        public boolean verify(JComponent input) {
         if (input instanceof JFormattedTextField) {
             JFormattedTextField ftf = (JFormattedTextField)input;
             AbstractFormatter formatter = ftf.getFormatter();
             if (formatter != null) {
                 String text = ftf.getText();
                 try {
                      formatter.stringToValue(text);
                      return true;
                  } catch (ParseException pe) {
                      return false;
                  }
              }
          }
          return true;
      }
      public boolean shouldYieldFocus(JComponent input) {
          return verify(input);
      }
    

    }


I would check the input in the textbox callback and simply make the box red or create an alert message nearby. You can remove the non-numeric character from the textbox string.


Use JFormattedTextField.

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