Character 限制JTextField字符输入
所以我搜索了整个互联网,在每一个主题中我都找到了这个限制JTextField输入的解决方案Character 限制JTextField字符输入,character,limit,document,jtextfield,Character,Limit,Document,Jtextfield,所以我搜索了整个互联网,在每一个主题中我都找到了这个限制JTextField输入的解决方案 public class FixedDocument extends PlainDocument { private int limit; // optional uppercase conversion private boolean toUppercase = false; FixedDocument(int limit) { super(); this.limit =
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);
}
}
}
有人知道我做错了什么吗?你的问题是导入了错误的AttributeSet类。您正在导入
javax.print.attribute.AttributeSet
,而您应该导入javax.swing.text.AttributeSet
,错误消息告诉您这一点。同样,我自己也会使用DocumentFilter,因为这就是它的构建目的。我自己也会使用DocumentFilter。
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)