?? phonebook.java
字號(hào):
import java.util.*;
import java.io.*;
class PhoneBook implements Serializable
{
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();
}
public PhoneBook()
{
if(filename.exists())
try
{
ObjectInputStream in = new ObjectInputStream(
new FileInputStream(filename));
phonebook = (HashMap)in.readObject();
in.close();
}
catch(ClassNotFoundException e)
{
System.out.println(e);
}
catch(IOException e)
{
System.out.println(e);
}
}
public void save()
{
try
{
System.out.println("Saving phone book");
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(filename));
out.writeObject(phonebook);
System.out.println(" Done");
out.close();
}
catch(IOException e)
{
System.out.println(e);
}
}
// List all entries in the book
public void listEntries()
{
// Get the keys as a list
LinkedList persons = new LinkedList(phonebook.keySet());
Collections.sort(persons); // Sort the keys
Iterator iter = persons.iterator(); // Get iterator for sorted keys
while(iter.hasNext())
System.out.println(phonebook.get((Person)iter.next()));
}
private File filename = new File("Phonebook.bin");
private HashMap phonebook = new HashMap();
}
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