customdates.java

Java经典例程 从外国一大学计算机教授出版物下载的代码 经典

import java.text.*;
import java.util.*;
import javagently.*;
import java.io.*;

class CustomDates {

  /* Testing date formatting   by J M Bishop Dec 1997
   * -----------------------   Java 1.1
   *                           Java 2 July 2000
   *
   * Writes dates in multiple formats and
   * prompts for dates back in the same form.
   */

  Stream in = new Stream (System.in);
  Date d = new Date ();
  Date my = new Date();

  void echoDate(String style, DateFormat Din,DateFormat Dout)
                       throws IOException {
    System.out.println(style+"\t"+Din.format(d));
    String s = in.readLine();
    System.out.println("\t\t\t"+s);
    try {
      my = Din.parse(s);
    }
    catch (ParseException e) {
      System.out.println("Invalid date "+s);
    }
    System.out.println("\t\t\t"+Dout.format(my));
  }

  CustomDates() throws IOException {

    Locale.setDefault(Locale.UK);
    DateFormat DS = DateFormat.getDateInstance(DateFormat.SHORT);
    DateFormat DM = DateFormat.getDateInstance(DateFormat.MEDIUM);
    DateFormat DL = DateFormat.getDateInstance(DateFormat.LONG);
    DateFormat DF = DateFormat.getDateInstance(DateFormat.FULL);
    DateFormat DD = DateFormat.getDateInstance(DateFormat.DEFAULT);

    echoDate("SHORT",DS,DF);
    echoDate("MEDIUM",DM,DF);
    echoDate("LONG",DL,DF);
    echoDate("FULL",DF,DF);
    echoDate("DEFAULT",DD,DF);
  }

  public static void main (String args []) throws IOException {
    new CustomDates();
  }

}