Do I have 32 or 64 bit Java Installed?

Hopefully by now you’re familiar with…

java -version

… to determine what version of Java you have installed, but sometimes you may want to know if you’re running a 32 bit or 64 bit version because you get an error like this…

Can't load AMD 64-bit .dll on a IA 32-bit platform

… to find out just run this variation of the command…

java -d64 -version

… if you have a 64 bit version you’ll get typical output. If not, you’ll get an error similar to this…

This Java instance does not support a 64-bit JVM.
Please install the desired version.
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