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Pi4J Java API & Runtime Library
There is a newer version: 2.7.0
package com.pi4j.wiringpi;

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Library (Core)
 * FILENAME      :  Nes.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 - 2015 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.util.NativeLibraryLoader;

/**
 * 
 * Before using the Pi4J library, you need to ensure that the Java VM in configured with access to
 * the following system libraries:
 * 

 * pi4j
 * wiringPi
 * 
 *  This library depends on the wiringPi native system library.
 (developed by
 * Gordon Henderson @ http://wiringpi.com/)
 * 
 * 
 * 
 * @see http://www.pi4j.com/
 * @see http://wiringpi.com/dev-lib/
 * @author Robert Savage (http://www.savagehomeautomation.com)
 */
public class Nes {

    public static final int NES_RIGHT = 0x01;
    public static final int NES_LEFT = 0x02;
    public static final int NES_DOWN = 0x04;
    public static final int NES_UP = 0x08;
    public static final int NES_START = 0x10;
    public static final int NES_SELECT = 0x20;
    public static final int NES_B = 0x40;
    public static final int NES_A = 0x80;
    public static final int PULSE_TIME = 25;
    public static final int MAX_NES_JOYSTICKS = 8;

    // private constructor 
    private Nes() {
        // forbid object construction 
    }
    
    static {
        // Load the platform library
        NativeLibraryLoader.load("libpi4j.so");
    }

    /**
     * setupNesJoystick:
     * 
     * Create a new NES joystick interface, program the pins, etc.
     * 
     * @param dPin data pin
     * @param cPin clock pin
     * @param lPin pin number
     * @return return joystick handle
     */
    public static native int setupNesJoystick(int dPin, int cPin, int lPin);

    /**
     * readNesJoystick:
     * 
     * Do a single scan of the NES Joystick.
     * 
     * @param joystick joystick handle
     * @return return value
     */
    public static native int readNesJoystick(int joystick);
}