G.4.1. Creating and Using a CommissionEmployee Class

We begin by declaring class CommissionEmployee (Fig. G.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 example only for demonstration purposes.

Overview of Class CommissionEmployee’s Methods and Instance Variables

Class CommissionEmployee’s public services include a constructor (lines ...

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