Returns true if any two items in the array are equal to one another. Any null values in the array are ignored.

      
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 {

  /**
   * Returns <code>true</code> if any two items in the array are equal to
   * one another.  Any <code>null</code> values in the array are ignored.
   *
   * @param array  the array to check.
   *
   * @return A boolean.
   */
  public static boolean hasDuplicateItems(final Object[] array) {
      for (int i = 0; i < array.length; i++) {
          for (int j = 0; j < i; j++) {
              final Object o1 = array[i];
              final Object o2 = array[j];
              if (o1 != null && o2 != null) {
                  if (o1.equals(o2)) {
                      return true;
                  }
              }
          }
      }
      return false;
  }

}

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Returns true if any two items in the array are equal to one another. Any null values in the array are ignored. : Array Compare « Collections Data Structure « Java

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