  We present a precise measurement of the CP violation parameter sin2phi_1 and
the direct CP violation parameter A_f using the final data sample of 772x10^6
B\bar B pairs collected at the Upsilon(4S) resonance with the Belle detector at
the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed
in a J/psi K0S, psi(2S) K0S, chi_c1 K0S or J/psi K0L CP-eigenstate and its
flavor is identified from the decay products of the accompanying B meson. From
the distribution of proper time intervals between the two B decays, we obtain
the following CP violation parameters:
sin2phi_1=0.667+-0.023(stat)+-0.012(syst) and
A_f=0.006+-0.016(stat)+-0.012(syst).
