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Pi4J Java Examples using the Pi4J Library
There is a newer version: 1.4

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Examples
 * FILENAME      :  WiringPiGpioExample.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.wiringpi.Gpio;
import com.pi4j.wiringpi.GpioUtil;

public class WiringPiGpioExample {

    // Simple sequencer data
    // Triplets of LED, On/Off and delay

    private static final int data[] = {
            0, 1, 1, 1, 1, 1, 0, 0, 0, 2, 1, 1, 1, 0, 0, 3, 1, 1, 2, 0, 0, 4, 1, 1, 3, 0, 0, 5, 1, 1, 4,
            0, 0, 6, 1, 1, 5, 0, 0, 7, 1, 1, 6, 0, 1, 7, 0, 1,
            0, 0,
            1, // Extra delay
            // Back again
            7, 1, 1, 6, 1, 1, 7, 0, 0, 5, 1, 1, 6, 0, 0, 4, 1, 1, 5, 0, 0, 3, 1, 1, 4, 0, 0, 2, 1,
            1, 3, 0, 0, 1, 1, 1, 2, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1,
            0, 0, 1, // Extra delay
            9, 9, 9, // End marker
    };

    public static void main(String args[]) throws InterruptedException {
        int pin;
        int dataPtr;
        int l, s, d;

        System.out.println("<--Pi4J--> GPIO test program");

        // setup wiringPi
        if (Gpio.wiringPiSetup() == -1) {
            System.out.println(" ==>> GPIO SETUP FAILED");
            return;
        }

        // set GPIO 4 as the input trigger
        GpioUtil.export(7, GpioUtil.DIRECTION_IN);
        GpioUtil.setEdgeDetection(7, GpioUtil.EDGE_BOTH);
        Gpio.pinMode (7, Gpio.INPUT) ;
        Gpio.pullUpDnControl(7, Gpio.PUD_DOWN);

        // set all other GPIO as outputs
        for (pin = 0; pin < 7; ++pin) {
            // export all the GPIO pins that we will be using
            GpioUtil.export(pin, GpioUtil.DIRECTION_OUT);
            Gpio.pinMode(pin, Gpio.OUTPUT);
        }

        dataPtr = 0;
        while (true) {
            l = data[dataPtr++]; // LED
            s = data[dataPtr++]; // State
            d = data[dataPtr++]; // Duration (10ths)

            if ((l + s + d) == 27) {
                dataPtr = 0;
                continue;
            }

            Gpio.digitalWrite(l, s);

            if (Gpio.digitalRead(7) == 1) // Pressed as our switch shorts to ground
                Gpio.delay(d * 10); // Faster!
            else
                Gpio.delay(d * 100);
        }
    }
}