The application locale property allows an application to have a default locale that is different from the default locale of the voice response node. For example, you might want to run an English version, a French version, and a Spanish version of an application on the same voice response node. The application locale for each version determines the default language and country or region (and optionally a user-defined variant) of all voice segments in the application.
public void voiceMain() throws WVRException {
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// Create the application properties object
ApplicationProperties applicationProperties = new ApplicationProperties();
// Set the application locale
applicationProperties.setLocale(Locale.US);
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}