Java Reference
In-Depth Information
Display 7.5
The Derived Class SalariedEmployee (part 2 of 2)
39
/**
40
Returns the pay for the month.
42 public double getPay()
43 {
41
*/
44
return salary/12;
45 }
46
/**
47
Precondition: newSalary is nonnegative.
48
*/
49
public void setSalary( double newSalary)
50 {
51
if (newSalary >= 0)
52 salary = newSalary;
53 else
54 {
55 System.out.println("Fatal Error: Negative salary.");
56 System.exit(0);
57 }
58 }
59
public String toString()
60 {
61
return (getName() + " " + getHireDate().toString()
62 + "\n$" + salary + " per year");
63 }
64
public boolean equals(SalariedEmployee other)
65 {
66
return (getName().equals(other.getName())
67 && getHireDate().equals(other.getHireDate())
68 && salary == other.salary);
69 }
70 }
We will show you a better way to
define equals in the subsection
“The Right Way to Define equals.”
parent class
Parent and Child Classes
child class
A base class is often called the parent class . A derived class is then called a child class .
This analogy is often carried one step further. A class that is a parent of a parent of a parent
of another class (or some other number of “parent of” iterations) is often called an ancestor
class . If class A is an ancestor of class B, then class B is often called a descendent of class A.
ancestor class
descendent
class
 
 
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