java -versionand make sure you are seeing the correct Java Virtual Machine. You must be running Java 6 or 7. If you are not, update the PATH Environment variable. Download Assign3Tester.class, and place it in the same folder that contains the cop3530 folder contaning its class files (from Netbeans this will be build\classes; DO NOT place Assign3Tester.class in the cop3530 folder itself). The test program is Assign3Tester which you can run from the command line. To set the PATH, you have two options.
.;C:\your folder where the Java system resideswhich is something along the lines of C:\jdk6\bin. There are several youtube videos available that illustrate this or you can look for documents such as this one.
set PATH=C:\jdk6\bin;%PATH%from you command line. But you will need to do this every time you bring up a new MS-DOS prompt.