Bash indirect array addressing?

Question

Suppose I have some bash arrays:

A1=(apple trees)
A2=(building blocks)
A3=(color television)

And index J=2, how

Answer 1

I've already found a resolution, this can be done by:

$ Aref=A$J
$ echo ${!Aref}
building
$ Aref=A$J[1]
$ echo ${!Aref}
blocks
$ Aref=A$J[@]
$ echo "${!Aref}"
building blocks