java泛型案例之电话簿

1、Person.java。记录电话簿的人名。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package PhoneText;

import java.io.*;
import java.util.*;

/**
 *
 * @author pc
 */
public class Person implements Comparable,Serializable{
    private String firstName;
    private String surName;
    
    public Person(String firstName,String surName)
    {
        this.firstName=firstName;
        this.surName=surName;
    }
    
    public String toString()
    {
        return firstName+""+surName;
    }
    
    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();
    }
    
    public static Person readPerson()
    {
        Scanner in = new Scanner(System.in);
        System.out.println("\nEnter first name:");
        String firstName = in.nextLine().trim();
        
        System.out.println("Enter surName:");
        String surName=in.nextLine().trim();
        return new Person(firstName,surName);
    }
}

2、PhoneNumber.java。记录某个电话号码的信息，包括区号和电话号码。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package PhoneText;

import java.io.*;
import java.util.*;

/**
 *
 * @author pc
 */
class PhoneNumber implements Serializable{
    private String areaCode;
    private String number;
    public PhoneNumber(String areaCode,String number)
    {
        this.areaCode=areaCode;
        this.number=number;
    }

    public String toString() {
        return areaCode + " " + number;
    }
    
    public static PhoneNumber readNumber()
    {
        Scanner in = new Scanner(System.in);
        System.out.println("\nEnter the area code:");
        String area = in.nextLine();
//        System.out.println("Enter the local code:");
//        area = in.nextLine();
        System.out.println("Enter the number：");
        String number =""+in.nextLine();
        return new PhoneNumber(area,number);
    }
}

3、BookEntry.java。记录电话簿的每一项内容，包括人名和电话号码。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package PhoneText;

/**
 *
 * @author pc
 */
public class BookEntry {
    private Person person;
    private PhoneNumber number;

    public BookEntry(Person person, PhoneNumber number) {
        this.person = person;
        this.number = number;
    }
    
    public Person getPerson(){return person;}
    public PhoneNumber getNumber(){return number;}
    public String toString(){ return person.toString()+"\n"+number.toString();}
    public static BookEntry readEntry()
    {
        return new BookEntry(Person.readPerson(),PhoneNumber.readNumber());
    }
}

4、PhoneBook.java。作为电话簿存储相应信息。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package PhoneText;

import java.util.*;

/**
 *
 * @author pc
 */
class PhoneBook {
    private HashMap<Person,BookEntry>phonebook=new HashMap<Person,BookEntry>();
    public void addEntry(BookEntry entry)
    {
        phonebook.put(entry.getPerson(), entry);
    }
    
    public BookEntry getEntry(Person key)
    {
        return (BookEntry)phonebook.get(key);
    }
    
    public PhoneNumber getNumber(Person key)
    {
        return getEntry(key).getNumber();
    }
}

5、TryPhoneBook.java。主面板。

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package PhoneText;

import java.util.*;

/**
 *
 * @author pc
 */
public class TryPhoneBook {
    public static void main(String[] args) {
        PhoneBook book = new PhoneBook();
        Scanner in = new Scanner(System.in);
        Person someone;
        for(;;)
        {
            System.out.println("Enter 1 to enter a new phone book entry\n"+"Enter 2 to find the number for a name\nEnter 9 to quit");
            int what = in.nextInt();
            switch(what){
                case 1:
                    book.addEntry(BookEntry.readEntry());
                    break;
                case 2:
                    someone = Person.readPerson();
                    BookEntry entry = book.getEntry(someone);
                    if(entry==null)
                        System.out.println("The number for"+someone+"was not found.");
                    else
                        System.out.println("The number for"+someone+"is"+book.getEntry(someone).getNumber());
                    break;
                case 9:
                    System.out.println("Ending program.");
                    return;
                default:
                    System.out.println("Invalid delection,try again.");
                    break;
            }
        }
    }
}

如果出现中文乱码，将项目的编码设置为GB2312。！！！