default void swap(final int i, final int j) {
		final T temp = get(i);
		set(i, get(j));
		set(j, temp);
	}
Swap the elements at the two positions.

@param i the index of the first element.
@param j the index of the second element.
@throws IndexOutOfBoundsException if {@code i < 0 || j >= length()}.
jenetics/src/main/java/io/jenetics/util/MSeq.java