In case of black body radiations , radiations give continuous spectra
No. The radiation is still quantized, it just can't be identified with much ease as in the case of an atom or molecule. Because there are an enormous number of particles on a black body and there are all possible states you can think of. Since the radiation is emitted because a particle moves from one state to another, black body can have all kinds of radiation. We can consider it continuous as the number of particles grew out of the quantum limit so that we can no longer detect the discrete spectra as in a single atom or molecule. In other words a black body is safely above the classical limit so that quantum effects can be neglected with sufficient precision.