  The dc Josephson effect in a superconducting quantum point contact, where
supercurrent flows through a small number of channels, is reviewd. The central
role of Andreev levels is emphasized which carry the whole supercurrent in
short symmetric Josephson junctions including tunnel junctions. A simple
intuitive view of the dc Josephson effect in a quantum point contact is given
in terms of multiple Andreev reflections. The quantization of the critical
current in superconducting quantum point contacts is briefly discussed.
