static boolean containsAllImpl(Collection<?> self, Collection<?> c) {
    for (Object o : c) {
      if (!self.contains(o)) {
        return false;
      }
    }
    return true;
  }
static boolean containsAllImpl(Collection<?> self, Collection<?> c) {
    for (Object o : c) {
      if (!self.contains(o)) {
        return false;
      }
    }
    return true;
  }
static boolean containsAllImpl ( Collection < ? > self , Collection < ? > c ) { for ( Object o : c ) { if ( ! self . contains ( o ) ) { return false ; } } return true ; }
Returns {@code true} if the collection {@code self} contains all of the elements in the
collection {@code c}.

<p>This method iterates over the specified collection {@code c}, checking each element returned
by the iterator in turn to see if it is contained in the specified collection {@code self}. If
all elements are so contained, {@code true} is returned, otherwise {@code false}.

@param self a collection which might contain all elements in {@code c}
@param c a collection whose elements might be contained by {@code self}
Returns { @code true } if the collection { @code self } contains all of the elements in the collection { @code c } .