Summary

Person Class — The Final Version

Example 23.14 gives the code for the final version of the Person class. In its current state it can be expected to perform predictably in many application contexts.

Example 23.14: Person.java (Final Version)

 1     import java.util.*; 2     import java.io.*; 3 4     public class Person implements Cloneable, Comparable, Serializable { 5       private String first_name = null; 6       private String middle_name = null; 7       private String last_name = null; 8       private Calendar birthday = null; 9       private String gender = null; 10 11      public static final String MALE = "Male"; 12      public static final String FEMALE = "Female"; 13 14      public Person(String f_name, String m_name, String l_name, int dob_year, int dob_month, 15                    int dob_day, String gender){ 16        first_name = f_name; 17        middle_name = m_name; 18        last_name = l_name; 19        this.gender = gender; 20 21        birthday = Calendar.getInstance(); 22        birthday.set(dob_year, dob_month, dob_day); 23      } 24 25      public int getAge(){ 26        Calendar today = Calendar.getInstance(); 27        int now = today.get(Calendar.YEAR); 28        int then = birthday.get(Calendar.YEAR); 29        return (now - then); 30      } 31 32      public String getFullName(){ return (first_name + " " + middle_name + " " + last_name); } 33 34      public String getFirstName(){ return first_name; } 35      public void setFirstName(String f_name) { first_name = f_name; } 36 37      public String getMiddleName(){ return middle_name; } 38      public void setMiddleName(String m_name){ middle_name = m_name; } 39 40      public String getLastName(){ return last_name; } 41      public void setLastName(String l_name){ last_name = l_name; } 42 43      public String getNameAndAge(){ return (getFullName() + " " + getAge()); } 44 45      public String getGender(){ return gender; } 46      public void setGender(String gender){ this.gender = gender; } 47 48      public void setBirthday(int year, int month, int day){ birthday.set(year, month, day); } 49 50      public String toString(){ 51        return this.getFullName() + " " + gender + " " + birthday.get(Calendar.DATE) + "/" 52               + birthday.get(Calendar.MONTH) + "/" + birthday.get(Calendar.YEAR); 53      } 54 55      public boolean equals(Object o){ 56        if(o == null) return false; 57        boolean is_equal = false; 58        if(o instanceof Person){ 59          if(this.first_name.equals(((Person)o).first_name) && 60             this.middle_name.equals(((Person)o).middle_name) && 61             this.last_name.equals(((Person)o).last_name) && this.gender.equals(((Person)o).gender) && 62             (this.birthday.get(Calendar.YEAR) == ((Person)o).birthday.get(Calendar.YEAR)) && 63             (this.birthday.get(Calendar.MONTH) == ((Person)o).birthday.get(Calendar.MONTH)) && 64             (this.birthday.get(Calendar.DATE) == ((Person)o).birthday.get(Calendar.DATE)) ){ 65               is_equal = true; 66            } 67        } 68        return is_equal; 69      } 70 71      public int hashCode(){ 72        return this.toString().hashCode(); 73      } 74 75      public Object clone() throws CloneNotSupportedException { 76        super.clone(); 77        return new Person(new String(first_name), new String(middle_name), new String(last_name), 78                 birthday.get(Calendar.YEAR), birthday.get(Calendar.MONTH), birthday.get(Calendar.DATE), 79                 new String(gender)); 80      } 81 82      public int compareTo(Object o){ 83        return this.toString().compareTo(o.toString()); 84      } 85 86    } //end Person class