If the given objects are equal : Equals « Class « Java

If the given objects are equal

import java.lang.reflect.Array;
import java.util.Arrays;

 * Copyright 2002-2007 the original author or authors.
 * 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
 *      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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

//Revised from springframework

 * Miscellaneous object utility methods. Mainly for internal use within the
 * framework; consider Jakarta's Commons Lang for a more comprehensive suite
 * of object utilities.
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Alex Ruiz
 * @since 19.03.2004
 * @see org.apache.commons.lang.ObjectUtils
abstract class ObjectUtils {

  private static final int INITIAL_HASH = 7;
  private static final int MULTIPLIER = 31;

  private static final String EMPTY_STRING = "";
  private static final String NULL_STRING = "null";
  private static final String ARRAY_START = "{";
  private static final String ARRAY_END = "}";
  private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END;
  private static final String ARRAY_ELEMENT_SEPARATOR = ", ";

   * Determine if the given objects are equal, returning <code>true</code>
   * if both are <code>null</code> or <code>false</code> if only one is
   * <code>null</code>.
   * <p>Compares arrays with <code>Arrays.equals</code>, performing an equality
   * check based on the array elements rather than the array reference.
   * @param o1 first Object to compare
   * @param o2 second Object to compare
   * @return whether the given objects are equal
   * @see java.util.Arrays#equals
  public static boolean nullSafeEquals(Object o1, Object o2) {
    if (o1 == o2) {
      return true;
    if (o1 == null || o2 == null) {
      return false;
    if (o1.equals(o2)) {
      return true;
    if (o1 instanceof Object[] && o2 instanceof Object[]) {
      return Arrays.equals((Object[]) o1, (Object[]) o2);
    if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
      return Arrays.equals((boolean[]) o1, (boolean[]) o2);
    if (o1 instanceof byte[] && o2 instanceof byte[]) {
      return Arrays.equals((byte[]) o1, (byte[]) o2);
    if (o1 instanceof char[] && o2 instanceof char[]) {
      return Arrays.equals((char[]) o1, (char[]) o2);
    if (o1 instanceof double[] && o2 instanceof double[]) {
      return Arrays.equals((double[]) o1, (double[]) o2);
    if (o1 instanceof float[] && o2 instanceof float[]) {
      return Arrays.equals((float[]) o1, (float[]) o2);
    if (o1 instanceof int[] && o2 instanceof int[]) {
      return Arrays.equals((int[]) o1, (int[]) o2);
    if (o1 instanceof long[] && o2 instanceof long[]) {
      return Arrays.equals((long[]) o1, (long[]) o2);
    if (o1 instanceof short[] && o2 instanceof short[]) {
      return Arrays.equals((short[]) o1, (short[]) o2);
    return false;



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