9.4.1 Creating and Using a CommissionEmployee Class
We begin by declaring class CommissionEmployee
(Fig. 9.4). Line 4 begins the class declaration and indicates that class CommissionEmployee
extends (i.e., inherits from) class Object (from package java.lang
). This causes class CommissionEmployee
to inherit the class Object
’s methods—class Object
does not have any fields. If you don’t explicitly specify which class a new class extends, the class extends Object
implicitly. For this reason, you typically will not include “extends Object
” in your code—we do so in this one example only for demonstration purposes.
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