Do these first.
Laboratory assignments are developed to be your first hands-on exposure to specific language elements in java. Labs are by no means sufficient to achieve a fluent understanding of the each part of Java, but they are essential for learning basic principles. More complex and subtle usages of these elements can be seen in homeworks, exams, and practice exams, and it is your responsibility to understand those usages as well.
Labs were developed for [CSE2] by Brian Chen, Brian Davison, Shahida Parvez, Mark Earl, and Edwin Kay. Labs may be used for other courses by permission only (Contact Brian Chen).