edu.pdx.cs410J.datesAndText.AroundTheWorld Maven / Gradle / Ivy
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package edu.pdx.cs410J.datesAndText;
import java.io.*;
import java.text.*;
import java.util.*;
/**
* This class shows off some of Java's internationalization (i18n)
* capabilities using the Locale class.
*/
public class AroundTheWorld {
private static PrintWriter out = new PrintWriter(System.out, true);
private static PrintWriter err = new PrintWriter(System.err, true);
private static void usage() {
err.println("usage: java AroundTheWorld [options]");
err.println(" -country code Which country?");
err.println(" -language code Which language?");
err.println(" -timeZone code Which time zone?");
err.println("If any code is ??, then all possible values for " +
"that code are printed");
System.exit(1);
}
/**
* Prints the available locales formatted using a given locale.
*/
private static void printAvailableLocales(Locale locale) {
Locale[] locales = Locale.getAvailableLocales();
out.println("Available locales:");
for (int i = 0; i < locales.length; i++) {
Locale l = locales[i];
out.println("Locale " + i + " of " + locales.length);
out.println(" Name: " + l.getDisplayName(locale));
out.println(" Country: " + l.getDisplayCountry(locale) + " (" +
l.getCountry() + ")");
out.println(" Language: " + l.getDisplayLanguage(locale) +
" (" + l.getLanguage() + ")");
out.println(" Variant: " + l.getDisplayVariant(locale) + " (" +
l.getVariant() + ")");
}
}
/**
* Prints the codes for all available time zones formatted for a
* given locale.
*/
private static void printTimeZones(Locale locale) {
String[] codes = TimeZone.getAvailableIDs();
out.println("Time zones");
for (int i = 0; i < codes.length; i++) {
String code = codes[i];
TimeZone tz = TimeZone.getTimeZone(code);
out.println(" " + code + ": " + tz.getDisplayName(locale));
}
}
/**
* Prints out today's date and time in a specific locale.
*/
private static void printToday(Locale locale, TimeZone tz) {
DateFormat df =
DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL,
locale);
df.setTimeZone(tz);
out.println("Right now: " + df.format(new Date()));
}
/**
* Prints out a number in various locale-specific formats
*/
private static void printNumber(double number, Locale locale) {
NumberFormat nf;
nf = NumberFormat.getNumberInstance(locale);
out.println("A number: " + nf.format(number));
nf = NumberFormat.getCurrencyInstance(locale);
out.println("Currency: " + nf.format(number));
nf = NumberFormat.getPercentInstance(locale);
out.println("Percent: " + nf.format(number));
}
/**
* Parses the command line to determine which locale to display
* information in. Prints out dates, times, and currencies using
* various locales.
*/
public static void main(String[] args) {
String countryCode = null;
String languageCode = null;
String timeZoneCode = null;
// Parse the command line
for (int i = 0; i < args.length; i++) {
if (args[i].equals("-country")) {
if(++i >= args.length) {
err.println("** Missing country code");
usage();
}
countryCode = args[i];
} else if (args[i].equals("-language")) {
if(++i >= args.length) {
err.println("** Missing language code");
usage();
}
languageCode = args[i];
} else if (args[i].equals("-timeZone")) {
if(++i >= args.length) {
err.println("** Missing time zone code");
usage();
}
timeZoneCode = args[i];
} else {
err.println("** Unknown option: " + args[i]);
usage();
}
}
Locale locale;
if (countryCode == null) {
// Use default
locale = Locale.getDefault();
} else if (countryCode.equals("??")) {
locale = Locale.getDefault();
printAvailableLocales(locale);
} else if (languageCode == null) {
// Use default
locale = Locale.getDefault();
} else if (languageCode.equals("??")) {
locale = Locale.getDefault();
printAvailableLocales(locale);
} else {
locale = new Locale(languageCode, countryCode);
}
TimeZone timeZone;
if (timeZoneCode == null) {
// Use default
timeZone = TimeZone.getDefault();
} else if (timeZoneCode.equals("??")) {
timeZone = TimeZone.getDefault();
printTimeZones(locale);
} else {
timeZone = TimeZone.getTimeZone(timeZoneCode);
}
// Print out some interesting info
out.println("");
printToday(locale, timeZone);
printNumber(1234.56, locale);
out.println("");
}
}