Is the meta method "method(String)" default to java or just processing?

Often in my own Applets I use the method(String) method for button callbacks. I learned about it a while back from a thread here. For example:

void handleClicks (ArrayList buttons) {
  for (Button button : buttons) {
    if (button.isPressed()) {

I wanted to know more about it. However, google hasn't been too helpful locating this due to the meta nature of the method. Is this from Java or Processing Core?

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