Handle invalid input in the TextField event listener in SimpletimerDemo

[coderabbitai]

There is an existing bug in the TextField event listener in SimpletimerDemo.java, where invalid input is not properly handled. This issue was preserved in the recent refactor in PR #37.

PR: #37
Comment: #37 (comment)

The bug can be fixed by ensuring that the input value is a valid number before updating the time field. Here is a suggested fix:

new TextField("Start Time", e -> {
  try {
    time = new BigDecimal(e.getValue());
  } catch (NumberFormatException ex) {
    Notification.show("Invalid input. Please enter a valid number.");
    return;
  }
  update();
});

This issue needs to be addressed to improve the robustness of the application.