public static boolean contains(Object obj, Object element) {
        if (obj == null) {
            return false;
        }
        if (obj instanceof String) {
            if (element == null) {
                return false;
            }
            return ((String) obj).contains(element.toString());
        }
        if (obj instanceof Collection) {
            return ((Collection<?>) obj).contains(element);
        }
        if (obj instanceof Map) {
            return ((Map<?, ?>) obj).values().contains(element);
        }

        if (obj instanceof Iterator) {
            Iterator<?> iter = (Iterator<?>) obj;
            while (iter.hasNext()) {
                Object o = iter.next();
                if (equals(o, element)) {
                    return true;
                }
            }
            return false;
        }
        if (obj instanceof Enumeration) {
            Enumeration<?> enumeration = (Enumeration<?>) obj;
            while (enumeration.hasMoreElements()) {
                Object o = enumeration.nextElement();
                if (equals(o, element)) {
                    return true;
                }
            }
            return false;
        }
        if (obj.getClass().isArray() == true) {
            int len = Array.getLength(obj);
            for (int i = 0; i < len; i++) {
                Object o = Array.get(obj, i);
                if (equals(o, element)) {
                    return true;
                }
            }
        }
        return false;
    }
/**`这里写代码片`
     * 比较两个对象是否相等。<br>
     * 相同的条件有两个，满足其一即可：<br>
     * 1. obj1 == null && obj2 == null; 2. obj1.equals(obj2)
     *
     * @param obj1 对象1
     * @param obj2 对象2
     * @return 是否相等
     */
    public static boolean equals(Object obj1, Object obj2) {
        return (obj1 != null) ? (obj1.equals(obj2)) : (obj2 == null);
    }