Section 10.5 Case Study: Payroll System Using Polymorphism
• A hierarchy designer can demand that each concrete subclass provide an appropriate method implementation by including an abstract method in a superclass.
• Most method calls are resolved at execution time, based on the type of the object being manipulated. This process is known as dynamic binding (p. 417) or late binding.
• A superclass variable can be used to invoke only methods declared in the superclass.
• Operator instanceof (p. 417) determines if an object has the is-a relationship with a specific type.
• Every object in Java knows its own class and can access it through Object method getClass (p. 418), which returns an object of type Class (package java.lang).
• The is-a relationship ...
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