Java Object Equal safeEquals(Object o1, Object o2)

Description

Determine if the given objects are equal, returning true if both are null or false if only one is null.

License

Apache License

Parameter

Parameter	Description
o1	first Object to compare
o2	second Object to compare

Return

whether the given objects are equal

Declaration

public static boolean safeEquals(Object o1, Object o2) 

Method Source Code

//package com.java2s;
/**//  www.  jav  a  2s  .  com
 * Copyright 2016 benjobs
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.util.Arrays;

public class Main {
    /**
     * 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 Arrays#equals
     */
    public static boolean safeEquals(Object o1, Object o2) {
        if (o1 == null || o2 == null) {
            return false;
        }

        if (o1 == o2) {
            return true;
        }

        if (o1.equals(o2)) {
            return true;
        }
        if (o1.getClass().isArray() && o2.getClass().isArray()) {
            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;
    }

    /**
     * Determine whether the given object is an array:
     * either an Object array or a primitive array.
     * @param obj the object to check
     */
    public static boolean isArray(Object obj) {
        return (obj != null && obj.getClass().isArray());
    }
}

Related

1. objectsEqual(Object lhs, Object rhs)
2. objectsEqual(Object o1, Object o2)
3. objectsEqual(Object o1, Object o2)
4. objectsEqual(Object obj1, Object obj2)
5. objectsEqual(T a, T b)