FlypadJoystick is a Java wrapper for PPJoy. In other words, it enables you to control PPJoy's virtual joystick directly from Java.

Here goes a simple example.

    try {
        /*
         * Try to create a new joystick.
         */
        Joystick joystick = new Joystick();

        try {
            /*
             * Set joystick values
             */

            /*
             * Set analog values for Axis X/Y/Z,
             * Rotation X/Y/Z, Slider, Dial. Overall 8 axes.
             * 
             * Here we set the Z Axis to maximum.
             */
            joystick.analog[Joystick.ANALOG_AXIS_Z] = Joystick.ANALOG_MAX;
            
            /*
             * Set digital values for the buttons. Overall 16 buttons.
             *
             * Here we turn on the 13-th button
             */
            joystick.digital[12] = Joystick.DIGITAL_ON;

            /*
             * Send the data to the joystick. Keep in mind,
             * that the send method may throw a JoystickException
             */
            joystick.send();
        } finally {
            joystick.close();
        }
    } catch (JoystickException e) {
        e.printStackTrace();
    }

FlypadJoystick is licensed under the Apache 2.0 license. FlypadJoystick relies on JNA for native access. Note that one needs PPJoy installed before using FlypadJoystick.