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Tip of the Day
Language: Java
Expertise: Intermediate
Feb 12, 2001

WEBINAR:

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Building the Right Environment to Support AI, Machine Learning and Deep Learning


JTextfield For Digits Only


Subclass PlainDocument, then set the document of the JTextfield to the subclass as shown below:
 
JTextField myJTextfield;
myJTextfield.setDocument(new DigitsDocument());

class DigitsDocument extends PlainDocument {
         	public void insertString(int offs, String str, AttributeSet a)
throws BadLocationException {
                 	if (str == null) {
                     		 return;
                  	}
                  	char[] addedFigures = str.toCharArray();
			char c;
                  	for (int i = addedFigures.length; i > 0; i--) {
				c = addedFigures[i-1];
				if(Character.isDigit(c)){
					//System.out.println(
Roland Fru
 
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