Step 1: Install Java Development Kit

psychWithJava requires Java Development Kit (JDK) version 6.0 or above, available from java.sun.com. (Follow the link to download Java SE). A note on JDK versioning: JDK 5.0 and 6.0 are sometimes referred as JDK 1.5 and 1.6 respectively.

Linux Instructions for installing JDK on a linux system (Fedora 7).
Mac OS X: Mac OS X (Tiger, both PPC and Intel) version of Java 6 can be found at developer.apple.com/java/. Note: On Mac the default JDK version is still 1.4 (or 5.0 if you have recently performed a software update). To set the 6.0 as the default, you may have to run the preferences utility under /Applications/Utilities/Java/J2SE 6.0/ directory. If you like to inspect further, Java Virtual Machine (VM) is located under /System/Library/Frameworks/JavaVM.framework. More information on setting the default JDK on Mac is available on the download page.
MS Windows: There are no special instructions for Windows installation.

Step 2: Dowload the psychWithJava package

Download psychWithJava.jar and save it on your filesystem. The exact location does not matter. Apart from the package, if you are interested, the source code of all classes can be found here

Step 3: Setup your OS and/or development platform

Depending on your preferences, choose one of the following: