Compares the initial elements of two arrays.

      
import java.util.Arrays;

/* 
 * JCommon : a free general purpose class library for the Java(tm) platform
 * 
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library 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 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -------------------
 * ArrayUtilities.java
 * -------------------
 * (C) Copyright 2003-2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: ArrayUtilities.java,v 1.7 2008/09/10 09:21:30 mungady Exp $
 *
 * Changes
 * -------
 * 21-Aug-2003 : Version 1 (DG);
 * 04-Oct-2004 : Renamed ArrayUtils --> ArrayUtilities (DG);
 *
 */

public class Main {
  /**
   * Compares the initial elements of two arrays.
   *
   * @param a1  array 1.
   * @param a2  array 2.
   *
   * @return An integer showing the relative ordering.
   */
  public static int compareVersionArrays (Comparable[] a1, Comparable[] a2)
  {
    int length = Math.min (a1.length, a2.length);
    for (int i = 0; i < length; i++)
    {
      Comparable o1 = a1[i];
      Comparable o2 = a2[i];
      if (o1 == null && o2 == null)
      {
        // cannot decide ..
        continue;
      }
      if (o1 == null)
      {
        return 1;
      }
      if (o2 == null)
      {
         return -1;
      }
      int retval = o1.compareTo(o2);
      if (retval != 0)
      {
        return retval;
      }
    }
    return 0;
  }

}

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Compares the initial elements of two arrays. : Array Compare « Collections Data Structure « Java

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