io - Inquiry about ResourceBundle in java -

directly api:

otherwise, getbundle attempts locate property resource file using generated properties file name. generates path name candidate bundle name replacing "." characters "/" , appending string ".properties". attempts find "resource" name using classloader.getresource.

what mean replacing "." characters "/" example? ps:i ok appending .properties @ end.

say have package named

com.yourgroup.bundles 

containing file named

hello_en_us.properties 

you have specify either of following load bundle

resourcebundle bundle = resourcebundle.getbundle("com.yourgroup.bundles.hello"); resourcebundle bundle = resourcebundle.getbundle("com/yourgroup/bundles/hello"); 

basically javadoc telling how translates argument pass getbundle method find resource on classpath. me, default locale en_us, so

com.yourgroup.bundles.hello 

translates to

com/yourgroup/bundles/hello_en_us.properties 

it can use classloader find resource.

the resourcebundle implementation returns might custom class, if map name correctly. follow javadoc that. otherwise, it's properties resource bundle.

the magic happens in resourcebundle#newbundle(...)

string bundlename = tobundlename(basename, locale); // basename being 'com.yourgroup.bundles.hello' in example above ... final string resourcename = toresourcename(bundlename, "properties"); 

and simply

public final string toresourcename(string bundlename, string suffix) {     stringbuilder sb = new stringbuilder(bundlename.length() + 1 + suffix.length());     sb.append(bundlename.replace('.', '/')).append('.').append(suffix);     return sb.tostring(); }  ....  url url = classloader.getresource(resourcename); ... bundle = new propertyresourcebundle(stream); // stream comes url