1
所以我搜索了整個互聯網,並在每一個主題中,我找到了限制JTextField輸入的解決方案。限制JTextField字符輸入
public class FixedDocument extends PlainDocument {
private int limit;
// optional uppercase conversion
private boolean toUppercase = false;
FixedDocument(int limit) {
super();
this.limit = limit;
}
FixedDocument(int limit, boolean upper) {
super();
this.limit = limit;
toUppercase = upper;
}
public void insertString (int offset, String str, AttributeSet attr) throws BadLocationException {
if (str == null){
return;
}
if ((getLength() + str.length()) <= limit) {
if (toUppercase) str = str.toUpperCase();
super.insertString(offset, str, attr);
}
}
}
但我有一個代碼的問題。此代碼行「super.insertString(offset,str,attr);」給我錯誤:
no suitable method found for insertString(int,java.lanf.String,javax.print.attribute.AttributeSet)
method javax.swing.text.PlainDocument.insertString(int,java.lang.String,javax.text.AttributeSet) is not applicable
(actual argument javax.printattribute.AttributeSet cannot be converted to javax.swing.text.AttributeSet by method invocation conversion)
任何人有任何想法我在做什麼錯在這裏?
我會爲此使用一個DocumentFilter。 – 2012-05-09 16:05:52