How can I tell if I have Sun Java SDK installed?

Also, if I have it installed, how can I tell what version number?

All jdk come with a java compiler which is javac.exe
search for javac.exe.
It should be in jdk....../bin/javac.exe
if you can find one.Then jdk is installed.
Set path variable to get access from command prompt.

You can also get lot of freeware to check the same.

try this
java -version
C:\Program Files\Java\jdk1.6.0_03\bin>jav... -version
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing) Report It

Control Panel - Add Remove Programs will show it in the list.

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