?? jpasswordfield3_onlynumberdocument.java
字號:
import javax.swing.*;
import javax.swing.text.*;
import java.awt.Toolkit;
public class JPasswordField3_OnlyNumberDocument extends PlainDocument{
private int maxLength;
int result;
public JPasswordField3_OnlyNumberDocument(int maxLength){
this.maxLength = maxLength;
}
public void insertString(int offset,String str,AttributeSet att) throws BadLocationException
{
for(int i=0;i<=9;i++){
result = Integer.toString(i).compareTo(str);
if (result == 0){ //是數字才處理
if ( getLength() + str.length() > maxLength ){
Toolkit.getDefaultToolkit().beep();
}else{
super.insertString(offset,str,att);
}
}
}
}
}
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