1: // Fig. 10.4: Employee.java
2: // Employee abstract superclass.
3:
4: public abstract class Employee
5: {
6: private String firstName;
7: private String lastName;
8: private String socialSecurityNumber;
9:
10: // three-argument constructor
11: public Employee( String first, String last, String ssn )
12: {
13: firstName = first;
14: lastName = last;
15: socialSecurityNumber = ssn;
16: } // end three-argument Employee constructor
17:
18: // set first name
19: public void setFirstName( String first )
20: {
21: firstName = first;
22: } // end method setFirstName
23:
24: // return first name
25: public String getFirstName()
26: {
27: return firstName;
28: } // end method getFirstName
29:
30: // set last name
31: public void setLastName( String last )
32: {
33: lastName = last;
34: } // end method setLastName
35:
36: // return last name
37: public String getLastName()
38: {
39: return lastName;
40: } // end method getLastName
41:
42: // set social security number
43: public void setSocialSecurityNumber( String ssn )
44: {
45: socialSecurityNumber = ssn; // should validate
46: } // end method setSocialSecurityNumber
47:
48: // return social security number
49: public String getSocialSecurityNumber()
50: {
51: return socialSecurityNumber;
52: } // end method getSocialSecurityNumber
53:
54: // return String representation of Employee object
55: public String toString()
56: {
57: return String.format( "%s %s\nsocial security number: %s",
58: getFirstName(), getLastName(), getSocialSecurityNumber() );
59: } // end method toString
60:
61: // abstract method overridden by subclasses
62: public abstract double earnings(); // no implementation here
63: } // end abstract class Employee
64:
65:
66: /**************************************************************************
67: * (C) Copyright 1992-2005 by Deitel & Associates, Inc. and *
68: * Pearson Education, Inc. All Rights Reserved. *
69: * *
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72: * development, research, and testing of the theories and programs *
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