Method addAll

classpath/java/util/Collections.java:386–391

(int startIndex, Collection<? extends T> c)

    }

    @Override
    public boolean addAll(int startIndex, Collection<? extends T> c) {
      synchronized (lock) {
        return list.addAll(startIndex, c);
      }
    }

    @Override
    public int indexOf(Object value) {