SchrÖidinger Equation of an electron in nonhomogeneous magnetic fields is solved by numerical methods with plane wave approximation. The electronic tunneling and the corresponding ballistic conductance of two double-magnetic-barrier systems created by the lithographic patterning of conducting stripes (drive current) or type Ⅰ superconducting films interrupted by stripes are studied. The results show that the tunneling structures in different systems are dissimilar but the ballistic conductances are strikingly similar.