describe table query?

I'm trying to write an Access clone in java that will
use PostGres as a backend. Problem is, I need to be
able to list all the fields (and data types) in a
table. I know about "\d" but that only seems to work
on the command line client (doesn't work if I pass it
in as a query). I know in mysql DESCRIBE <table> will
do it... is there an equivalent in postgres? I tried
google but all I could find were references to the \d command.

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