  The cross sections for the ($^8$B,$^7$Be-$p$) breakup reaction on $^{58}$Ni
and $^{208}$Pb targets at the beam energies of 25.8 MeV and 415 MeV have been
calculated within a one-step prior-form distorted-wave Born approximation. The
relative contributions of Coulomb and nuclear breakup of dipole and quadrupole
multipolarities as well as their interference have been determined. The nuclear
breakup contributions are found to be substantial in the angular distributions
of the $^7$Be fragment for angles in the range of 30$^\circ$ - 80$^\circ$ at
25.8 MeV beam energy. The Coulomb-nuclear interference terms make the dipole
cross section larger than that of quadrupole even at this low beam energy.
However, at the incident energy of 415 MeV, these effects are almost negligible
in the angular distributions of the ($^7$Be-p) coincidence cross sections at
angles below 4$^\circ$.
