private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) {
int x=evt.getKeyCode();
if(x>=96&&x<=105)
{
evt.setKeyCode(8);//Here 8 is used for Backspace key to remove the numeric character entered
}
Int This code i want the user not to type any numeric value in jTextField but if he does so then i m trying to remove it off during runtime only.... I wrote this code but its not working as i expected it to be... Plzz Help me!!
You really should avoid KeyListeners, they are too limiting for what you are ultimately trying to achieve and you're only going to end up with a mutation exception as you try and change the fields document while the field is trying to change the document.
You really should be using a DocumentFilter, that's what it's design for.
((AbstractDocument)field.getDocument()).setDocumentFilter(new DocumentFilter() {
@Override
public void insertString(FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException {
StringBuilder sb = new StringBuilder(64);
for (char c : text.toCharArray()) {
if (Character.isDigit(c)) {
sb.append(c);
}
}
fb.insertString(offset, text, attr);
}
@Override
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
StringBuilder sb = new StringBuilder(64);
for (char c : text.toCharArray()) {
if (Character.isDigit(c)) {
sb.append(c);
}
}
fb.replace(offset, length, sb.toString(), attrs);
}
});
This is a really basic example, there are plenty on SO.
Apart from avoiding mutation exceptions, the filter intercepts the update before it reaches the document/field, so the incoming changes won't be visible of the screen, you also capture any paste events or setText calls.
While perhaps not the very best way to do it, here is one very simple way.
You can override the paintComponent() method of the JTextField like this:
JTextField textField = new JTextField(text) {
@Override
protected void paintComponent(Graphics grphcs) {
super.paintComponent(grphcs);
String newStr = "";
for (char c : getText().toCharArray()) {
if (!Character.isDigit(c)) {
newStr += c;
}
}
setText(newStr);
}
};
