person.java

JAVA 2入门经典 练习答案

import java.io.Serializable;

public class Person implements Comparable, Serializable {
  // Constructor
  public Person(String firstName, String surname) {
    this.firstName = firstName;
    this.surname = surname;
  }

  // We need this method to obtain the second name to use as a key
  public String getSecondname() {
    return surname;
  }
  public String toString() {
    return firstName + " " + surname;
  }


  // Compare Person objects
  public int compareTo(Object person) {
    int result = surname.compareTo(((Person)person).surname);
    return result == 0 ? firstName.compareTo(((Person)person).firstName):result;
  }


  public boolean equals(Object person) {
    return compareTo(person) == 0;
  }


  public int hashCode() {
    return 7*firstName.hashCode()+13*surname.hashCode();
  }

  // Read a person from the keyboard
  public static Person readPerson() {
    FormattedInput in = new FormattedInput();
    // Read in the first name and remove blanks front and back
    System.out.println("\nEnter first name:");
    String firstName = in.readString().trim();

    // Read in the surname, also trimming blanks
    System.out.println("Enter surname:");
    String surname = in.readString().trim();
    return new Person(firstName,surname);
  }
  
  public String getName(){ return firstName+" "+surname; }


  private String firstName;    // First name of person
  private String surname;      // Second name of person
}