phonebook.java~2~

来自「java2参考大全上的例子的源码和自己的理解.」· JAVA~2~ 代码 · 共 86 行

package 电话号码本;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

/* A simple telephone number database that uses
   a property list. */
import java.io.*;
import java.util.*;

class Phonebook {
  public static void main(String args[]) throws IOException {
    Properties ht = new Properties();
    BufferedReader br =
        new BufferedReader(new InputStreamReader(System.in));
    String name, number;
    FileInputStream fin = null;
    boolean changed = false;

    // Try to open phonebook.dat file.
    try {
      fin = new FileInputStream("phonebook.dat");
    }
    catch (FileNotFoundException e) {
      // ignore missing file
    }

    /* If phonebook file already exists,
       load existing telephone numbers. */
    try {
      if (fin != null) {
        ht.load(fin);
        fin.close();
      }
    }
    catch (IOException e) {
      System.out.println("Error reading file.");
    }

    // Let user enter new names and numbers.
    do {
      System.out.println("Enter new name" +
                         " ('quit' to stop): ");
      name = br.readLine();
      if (name.equals("quit")) {
        continue;
      }

      System.out.println("Enter number: ");
      number = br.readLine();

      ht.put(name, number);
      changed = true;
    }
    while (!name.equals("quit"));

    // If phone book data has changed, save it.
    if (changed) {
      FileOutputStream fout = new FileOutputStream("phonebook.dat");

      ht.store(fout, "Telephone Book");
      fout.close();
    }

    // Look up numbers given a name.
    do {
      System.out.println("Enter name to find" +
                         " ('quit' to quit): ");
      name = br.readLine();
      if (name.equals("quit")) {
        continue;
      }

      number = (String) ht.get(name);
      System.out.println(number);
    }
    while (!name.equals("quit"));
  }
}