It means that nViewerTest.movieCode has not been initialized, it's null. It seems like you've initialized it because you obtained an input from the user called MC, and you passed that String to the Viewer constructor that has a String argument called movieCode, but that argument wasn't used in the constructor. There are 2 variables with the same name. One movieCode is local to the constructor, and the other movieCode is a class Viewer instance variable.
A statement commonly seen in the constructor that would solve this problem is:
this.movieCode = movieCode;
This means that the Viewer instance variable movieCode is assigned the value passed to the constructor in the argument (local) variable movieCode.
Learning Java using Eclipse on OpenSUSE 11.2
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I changed the code and I know longer have the error. Thanks