public JoystickAxis getAxis() {
        return axis;
    }
Returns the JoystickAxis that triggered this event.

@return the pre-existing instance
@see com.jme3.input.JoystickAxis#assignAxis(java.lang.String, java.lang.String)
jme3-core/src/main/java/com/jme3/input/event/JoyAxisEvent.java