Created
July 16, 2019 11:13
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Accept only numbers for JTextfield in Swing. Pasting a string is also works for match.
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| //restrict the user to only input numeric format in the account field | |
| accountID.addKeyListener(new KeyAdapter() { | |
| @Override | |
| public void keyTyped(KeyEvent e) { | |
| super.keyTyped(e); | |
| char c = e.getKeyChar(); | |
| String regex = "[0-9]*"; | |
| Pattern pattern = Pattern.compile(regex); | |
| Matcher matcher = pattern.matcher(String.valueOf(c)); | |
| if(!matcher.matches()){ | |
| e.consume(); | |
| } | |
| } | |
| }); | |
| //add document listener to the account id to accept valid and only numeric input | |
| accountID.getDocument().addDocumentListener(new DocumentListener() { | |
| @Override | |
| public void insertUpdate(DocumentEvent e) { | |
| String regex = "[0-9]*"; | |
| Pattern pattern = Pattern.compile(regex); | |
| Matcher matcher = pattern.matcher(accountID.getText()); | |
| if(!matcher.matches()){ | |
| notificationLabel.setText("Invalid ID!"); | |
| } | |
| else{ | |
| notificationLabel.setText(""); | |
| } | |
| } | |
| @Override | |
| public void removeUpdate(DocumentEvent e) { | |
| String regex = "[0-9]*"; | |
| Pattern pattern = Pattern.compile(regex); | |
| Matcher matcher = pattern.matcher(accountID.getText()); | |
| if(!matcher.matches()){ | |
| notificationLabel.setText("Invalid ID!"); | |
| } | |
| else{ | |
| notificationLabel.setText(""); | |
| } | |
| } | |
| @Override | |
| public void changedUpdate(DocumentEvent e) { | |
| String regex = "[0-9]*"; | |
| Pattern pattern = Pattern.compile(regex); | |
| Matcher matcher = pattern.matcher(accountID.getText()); | |
| if(!matcher.matches()){ | |
| notificationLabel.setText("Invalid ID!"); | |
| } | |
| else{ | |
| notificationLabel.setText(""); | |
| } | |
| } | |
| }); |
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