Copies the given array and adds the given element at the end of the new array. (long value type) : Array Copy Clone « Collections « Java Tutorial

/*   Copyright 2004 The Apache Software Foundation
 *   Licensed 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
 *   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.

import java.lang.reflect.Array;

 * <p>Operations on arrays, primitive arrays (like <code>int[]</code>) and
 * primitive wrapper arrays (like <code>Integer[]</code>).</p>
 * <p>This class tries to handle <code>null</code> input gracefully.
 * An exception will not be thrown for a <code>null</code>
 * array input. However, an Object array that contains a <code>null</code>
 * element may throw an exception. Each method documents its behaviour.</p>
 * @author Stephen Colebourne
 * @author Moritz Petersen
 * @author <a href="">Fredrik Westermarck</a>
 * @author Nikolay Metchev
 * @author Matthew Hawthorne
 * @author Tim O'Brien
 * @author Pete Gieser
 * @author Gary Gregory
 * @author <a href="">Ashwin S</a>
 * @author Maarten Coene
 * @since 2.0
 * @version $Id: 632503 2008-03-01 00:21:52Z ggregory $
public class Main {
   * <p>Copies the given array and adds the given element at the end of the new array.</p>
   * <p>The new array contains the same elements of the input
   * array plus the given element in the last position. The component type of 
   * the new array is the same as that of the input array.</p>
   * <p>If the input array is <code>null</code>, a new one element array is returned
   *  whose component type is the same as the element.</p>
   * <pre>
   * ArrayUtils.add(null, 0)   = [0]
   * ArrayUtils.add([1], 0)    = [1, 0]
   * ArrayUtils.add([1, 0], 1) = [1, 0, 1]
   * </pre>
   * @param array  the array to copy and add the element to, may be <code>null</code>
   * @param element  the object to add at the last index of the new array
   * @return A new array containing the existing elements plus the new element
   * @since 2.1
  public static long[] add(long[] array, long element) {
      long[] newArray = (long[])copyArrayGrow1(array, Long.TYPE);
      newArray[newArray.length - 1] = element;
      return newArray;

   * Returns a copy of the given array of size 1 greater than the argument. 
   * The last value of the array is left to the default value.
   * @param array The array to copy, must not be <code>null</code>.
   * @param newArrayComponentType If <code>array</code> is <code>null</code>, create a 
   * size 1 array of this type.
   * @return A new copy of the array of size 1 greater than the input.
  private static Object copyArrayGrow1(Object array, Class newArrayComponentType) {
      if (array != null) {
          int arrayLength = Array.getLength(array);
          Object newArray = Array.newInstance(array.getClass().getComponentType(), arrayLength + 1);
          System.arraycopy(array, 0, newArray, 0, arrayLength);
          return newArray;
      return Array.newInstance(newArrayComponentType, 1);


9.5.Array Copy Clone
9.5.1.use Arrays.copyOf to copy array
9.5.2.Copying and Cloning Arrays
9.5.3.Doubling the size of an array
9.5.4.Array clone
9.5.5.Copy some items of an array into another array
9.5.6.Using Arrays.copyOf to copy an array
9.5.7.Copies the given array and adds the given element at the end of the new array. (long value type)