Checks whether two arrays are the same length, treating null arrays as length 0. : Array Objects « Collections « Java Tutorial

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import java.lang.reflect.Array;

/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *
 */


/**
 * @author Stephen Colebourne
 * @author Moritz Petersen
 * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
 * @author Nikolay Metchev
 * @author Matthew Hawthorne
 * @author Tim O'Brien
 * @author Pete Gieser
 * @author Gary Gregory
 * @author <a href="mailto:equinus100@hotmail.com">Ashwin S</a>
 * @author Maarten Coene
 * @since 2.0
 * @version $Id: ArrayUtils.java 632503 2008-03-01 00:21:52Z ggregory $
 */
public class Main {

  // Is same length
  //-----------------------------------------------------------------------
  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   *
   * Any multi-dimensional aspects of the arrays are ignored.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */    
  public static boolean isSameLength(Object[] array1, Object[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(long[] array1, long[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(int[] array1, int[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(short[] array1, short[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(char[] array1, char[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(byte[] array1, byte[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(double[] array1, double[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(float[] array1, float[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }

  /**
   * Checks whether two arrays are the same length, treating
   * <code>null</code> arrays as length <code>0</code>.
   * 
   * @param array1 the first array, may be <code>null</code>
   * @param array2 the second array, may be <code>null</code>
   * @return <code>true</code> if length of arrays matches, treating
   *  <code>null</code> as an empty array
   */
  public static boolean isSameLength(boolean[] array1, boolean[] array2) {
      if ((array1 == null && array2 != null && array2.length > 0) ||
          (array2 == null && array1 != null && array1.length > 0) ||
          (array1 != null && array2 != null && array1.length != array2.length)) {
              return false;
      }
      return true;
  }


}