Because it is a pure object-oriented programming language, all Java programs contain one or more class (or ADT) deÞnitions. Java deÞnes many built-in classes and hundreds of methods. The purpose of this laboratory is for you to review how you can implement an abstract data type (ADT) of your own design while utilizing some of the built-in ADTs already implemented in Java. We use a monthly logbook as our example ADT. A monthly logbook consists of a set of entries, one for each day of the month. Depending on the logbook, these entries might denote a businessÕs daily receipts, the amount of time a person spent.
