//Employee.java
public class Employee {
   private String firstName;
   private String lastName;
   private Date birthDate;				//birthDate的成員變量為Date對(duì)象的引用
   private Date hireDate;				//hireDate的成員變量為Date對(duì)象的引用
   public Employee( String first, String last, Date dateOfBirth, Date dateOfHire ){
      firstName = first;
      lastName = last;
      birthDate = dateOfBirth;
      hireDate = dateOfHire;
   }
   public String toEmployeeString(){
      return lastName + ", " + firstName +  
         "  Hired: " + hireDate.toDateString() +  
         "  Birthday: " + birthDate.toDateString();
   }
}