question: public synchronized void addResourceBundle ( String bundleName ) { if ( bundleName == null ) { return ; } if ( resourceBundles == null ) { resourceBundles = new Vector < String > ( 5 ) ; } if ( ! resourceBundles . contains ( bundleName ) ) { resourceBundles . add ( bundleName ) ; resourceCache . clear ( ) ; } }
target:  Adds a resource bundle to the list of resource bundles that are searched for localized values.  Resource bundles are searched in the reverse order they were added.  In other words, the most recently added bundle is searched first.