This is really "look it up in docs" type of question. Have you tried looking at the examples and reusing the code for example HERE? Please before asking search the documentation for examples - you will find that Wolfram Language documentation system is very helpful.
BTW if A and B just constants they just rescale the plot.
Plot3D[
BesselJ[0, Sqrt[x^2 + y^2]] BesselJ[1, Sqrt[x^2 + y^2]] ,
{x, -5, 5}, {y, -5, 5},
PlotPoints -> 50,
ColorFunction -> "Rainbow",
PlotStyle -> Opacity[0.8]]
