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Pi4J Java Examples using the Pi4J Library
There is a newer version: 1.4
// START SNIPPET: control-gpio-snippet

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Examples
 * FILENAME      :  ComputeModuleGpioExample.java
 *
 * This file is part of the Pi4J project. More information about
 * this project can be found here:  http://www.pi4j.com/
 * **********************************************************************
 * %%
 * Copyright (C) 2012 - 2016 Pi4J
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import com.pi4j.io.gpio.*;
import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent;
import com.pi4j.io.gpio.event.GpioPinListenerDigital;

/**
 * This example code demonstrates how to perform simple state
 * control of a GPIO pin on the Raspberry Pi.
 *
 * @author Robert Savage
 */
public class ComputeModuleGpioExample {

    public static void main(String[] args) throws InterruptedException {

        System.out.println("<--Pi4J--> GPIO Compute Module Example ... started.");

        // create GPIO controller
        final GpioController gpio = GpioFactory.getInstance();

        // create GPIO listener
        GpioPinListenerDigital listener  = new GpioPinListenerDigital() {
            @Override
            public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) {
                // display pin state on console
                System.out.println(" --> GPIO PIN STATE CHANGE: " + event.getPin() + " = " + event.getState());
            }
        };

        // provision gpio input pins with its internal pull down resistor enabled
        GpioPinDigitalInput[] pins = {
                gpio.provisionDigitalInputPin(RCMPin.GPIO_00, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_01, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_02, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_03, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_04, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_05, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_06, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_07, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_08, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_09, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_10, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_11, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_12, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_13, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_14, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_15, PinPullResistance.PULL_DOWN),
                // gpio.provisionDigitalInputPin(RCMPin.GPIO_16, PinPullResistance.PULL_DOWN), (error exporting GPIO 16?)
                gpio.provisionDigitalInputPin(RCMPin.GPIO_17, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_18, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_19, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_20, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_21, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_22, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_23, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_24, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_25, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_26, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_27, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_28, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_29, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_30, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_31, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_32, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_33, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_34, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_35, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_36, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_37, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_38, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_39, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_40, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_41, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_42, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_43, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_44, PinPullResistance.PULL_DOWN),
                gpio.provisionDigitalInputPin(RCMPin.GPIO_45, PinPullResistance.PULL_DOWN)
        };

        // create and register gpio pin listener
        gpio.addListener(listener, pins);

        System.out.println(" ... complete the any GPIO circuit (00 - 45) and see the listener feedback here in the console.");

        // keep program running until user aborts (CTRL-C)
        while(true) {
            Thread.sleep(500);
        }

        // stop all GPIO activity/threads by shutting down the GPIO controller
        // (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
        // gpio.shutdown();   <--- implement this method call if you wish to terminate the Pi4J GPIO controller
    }
}
//END SNIPPET: control-gpio-snippet