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

CantSayIHave

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()) {
      method(button.getCallback());
    }
  }
}

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?

GoToLoop

• Undocumented method method() belongs to class PApplet:

1. http://Processing.GitHub.io/processing-javadocs/everything/processing/core/PApplet.html#method-java.lang.String-
2. https://GitHub.com/processing/processing/blob/processing-0265-3.4/core/src/processing/core/PApplet.java#L3785-L3809

• It uses reflection and can only find other PApplet public void methods w/ no parameters
• It's also the base for the PApplet:thread() method:

1. https://Processing.org/reference/thread_.html
2. https://GitHub.com/processing/processing/blob/processing-0265-3.4/core/src/processing/core/PApplet.java#L3812-L3837

CantSayIHave

Thank you!