code: public static <T> boolean contains(final T[] array, final T element) {
  
      if (array == null) {
        return false;
      }
      int index = indexOf(array, element);
      return index != INDEX_OF_NOT_FOUND;
    }
docs: 判定指定的数组是否包含指定的元素。 Returns true if this array contains the given element;
  false otherwise. More formally, returns true if and only if this list
  contains at least one element e such that (o==null ? e==null :
  o.equals(e)).
  
  @param array 用来测试的数组。the array to be tested.
  @param element 用来测试的元素。the element to be tested.
  @return 如果给定的数组不为空且包含至少一个指定的元素则返回true，否则返回false。 true if given array
  contains given element; false otherwise.