How to automatically insert the data that is scanned using a barcode scanner in java? [closed]

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Add document change listener to textfield.

 // Listen for changes in the text
textField.getDocument().addDocumentListener(new DocumentListener() {
  public void changedUpdate(DocumentEvent e) {
    save(); // As per your requirement
  }
  public void removeUpdate(DocumentEvent e) {
    save(); // As per your requirement
  }
  public void insertUpdate(DocumentEvent e) {
    save(); 
  }

  public void save() {
    /*
      Write your implementation for saving
    */
  }
});

More info on How to Write a Document Listener

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