Method indexOf

lib/java/util/AbstractList.java:541–557

Searches this list for the specified object and returns the index of the first occurrence. @param object the object to search for. @return the index of the first occurrence of the object, or -1 if it was not found.

(Object object)

     *         not found.
     */
    public int indexOf(Object object) {
        ListIterator<?> it = listIterator();
        if (object != null) {
            while (it.hasNext()) {
                if (object.equals(it.next())) {
                    return it.previousIndex();
                }
            }
        } else {
            while (it.hasNext()) {
                if (it.next() == null) {
                    return it.previousIndex();
                }
            }
        }
        return -1;
    }

    /**
     * Returns an iterator on the elements of this list. The elements are