Java The Complete Reference, Seventh Edition

840 Part II: The Java Library

You can try this example without actually having a remote server. To do so, simply

install all of the programs on the same machine, startrmiregistry, startAddServer, and

then executeAddClientusing this command line:

java AddClient 127.0.0.1 8 9

Here, the address 127.0.0.1 is the “loop back” address for the local machine. Using this

address allows you to exercise the entire RMI mechanism without actually having to install

the server on a remote computer.

In either case, sample output from this program is shown here:

The first number is: 8

The second number is: 9

The sum is: 17.0

Text Formatting

The packagejava.textallows you to format, search, and manipulate text. Chapter 32 illustrates

itsNumberFormatclass, which is used to format numeric data. This section examines two

more of its most commonly used classes: those that format date and time information.

DateFormat Class

DateFormatis an abstract class that provides the ability to format and parse dates and

times. ThegetDateInstance( )method returns an instance ofDateFormatthat can format

date information. It is available in these forms:

static final DateFormat getDateInstance( )

static final DateFormat getDateInstance(intstyle)

static final DateFormat getDateInstance(intstyle, Localelocale)

The argumentstyleis one of the following values:DEFAULT,SHORT,MEDIUM,LONG,

orFULL. These areintconstants defined byDateFormat. They cause different details about

the date to be presented. The argumentlocaleis one of the static references defined byLocale

(refer to Chapter 18 for details). If thestyleand/orlocaleis not specified, defaults are used.

One of the most commonly used methods in this class isformat( ). It has several

overloaded forms, one of which is shown here:

final String format(Dated)

The argument is aDateobject that is to be displayed. The method returns a string containing

the formatted information.

The following listing illustrates how to format date information. It begins by creating

aDateobject. This captures the current date and time information. Then it outputs the date

information by using different styles and locales.

// Demonstrate date formats.

import java.text.*;

import java.util.*;

public class DateFormatDemo {

public static void main(String args[]) {

Date date = new Date();