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<p>Groovy leverages Java's I18N features. Here is a Swing example using Dates, Numbers and Locales:</p>
<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
import groovy.swing.SwingBuilder
import static javax.swing.JFrame.EXIT_ON_CLOSE as EXIT
import static java.text.NumberFormat.getNumberInstance as numberFormat
import static java.text.DateFormat.getDateInstance as dateFormat
import static java.text.DateFormat.FULL
def locales = [
    new Locale("en", "US"), new Locale("ja","JP"), new Locale("iw","IL"),
    new Locale("hi","IN"), new Locale("th","TH","TH"), new Locale("de", "DE"),
    new Locale("es", "ES"), new Locale("zh", "CN"), new Locale("it", "IT") ]
def swing = new SwingBuilder()
int row = 0
def d = new Date()
def frame = swing.frame(title:'Frame', size:[300,300],
        defaultCloseOperation:EXIT) {
    tableLayout {
        locales.each { loc ->
            tr {
                td { label(numberFormat(loc).format(++row)) }
                td { label(loc.toString()) }
                td { label(loc.getDisplayLanguage(loc)) }
                td { label(dateFormat(FULL, loc).format(d)) }
            }
        }
    }
}
frame.pack()
frame.show()
</pre></td></tr></table>

<p>Which should look something like this:<br />
<img class="confluence-embedded-image" src="/download/attachments/231080206/i18n.gif?version=1&amp;modificationDate=1369494870077" data-image-src="/download/attachments/231080206/i18n.gif?version=1&amp;modificationDate=1369494870077" data-linked-resource-id="231376253" data-linked-resource-type="attachment" data-linked-resource-default-alias="i18n.gif" data-base-url="http://docs.codehaus.org" data-linked-resource-container-id="231080206" title="null > i18n.gif"></p>

<p>You can also use properties files to capture language strings. Using the <code>LablesBundle.properties</code>, <code>LablesBundle.properties_de</code> and <code>LablesBundle_fr.properties</code> files from <a href="http://java.sun.com/docs/books/tutorial/i18n/resbundle/propfile.html">this</a> tutorial. We can then use this code:</p>

<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
def locales = [Locale.FRENCH, Locale.GERMAN, Locale.ENGLISH]
def keys = [ "s1", "s2", "s3", "s4" ]
[locales, keys].combinations().each{ loc, key ->
    def labels = ResourceBundle.getBundle("LabelsBundle", loc)
    println "Locale = ${loc.toString()}, key = $key, value = ${labels.getString(key)}"
}
</pre></td></tr></table>

<p>To produce this result:</p>

<table class="wysiwyg-macro" data-macro-name="code" data-macro-default-parameter="none" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGU6bm9uZX0&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
Locale = fr, key = s1, value = Ordinateur
Locale = de, key = s1, value = Computer
Locale = en, key = s1, value = computer
Locale = fr, key = s2, value = Disque dur
Locale = de, key = s2, value = Platte
Locale = en, key = s2, value = disk
Locale = fr, key = s3, value = Moniteur
Locale = de, key = s3, value = Monitor
Locale = en, key = s3, value = monitor
Locale = fr, key = s4, value = Clavier
Locale = de, key = s4, value = Tastatur
Locale = en, key = s4, value = keyboard
</pre></td></tr></table>