JTextField中没有空格 [英] No blanks in JTextField

问题描述

我如何禁止用户将空格放入JTextField？

甚至不可能写空格。

How can I forbid users to put blanks into a JTextField?
It should not even be possible to write blanks.

推荐答案

我建议使用扩展的PlainDocument设置JTextField的Document，在其中覆盖insertString方法。 （也很好限制大小...）

类似于：

I would suggest to set the Document of the JTextField with an extended PlainDocument in which you override the insertString method. (Also nice to limit the size...)
Something like:

Document doc = new PlainDocument() {
    @Override
    public void insertString(int offs, String str, AttributeSet attr)
    throws BadLocationException {
        String newstr = str.replaceAll(" ", "");  // could use "\\s" instead of " "
        super.insertString(offs, newstr, attr);
    }

    @Override
    public void replace(int offs, int len, String str, AttributeSet attr) 
    throws BadLocationException {
        String newstr = str.replaceAll(" ", "");  // could use "\\s" instead of " "
        super.replace(offs, len, newstr, attr);
    }
};
textField.setDocument(doc);

编辑：

替换也必须被覆盖/实施！

replace must also be overrided/implemented!

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