When you click a JButton, an event, known as an action event, is created.

JButton

A graphical user interface component in Java Swing that represents a push button which can be clicked by the user.

Action Event

An event in programming that is triggered by the user performing a specific action, such as clicking a button or pressing a key.

Click

An action typically recognized by a computer program as the pressing and releasing of a button on a pointing device.