private Map<String,ExtensionFileFilter> addExtensions(JFileChooser chooser){
  Map<String,ExtensionFileFilter> filters=new HashMap<String,ExtensionFileFilter>();
  for (  Map.Entry<String,String> entry : exts.entrySet()) {
    ExtensionFileFilter filter=new ExtensionFileFilter(entry.getKey(),entry.getValue());
    filters.put(entry.getKey(),filter);
    chooser.addChoosableFileFilter(filter);
  }
  return filters;
}

private Map < String , ExtensionFileFilter > addExtensions ( JFileChooser chooser ) { Map < String , ExtensionFileFilter > filters = new HashMap < String , ExtensionFileFilter > ( ) ; for ( Map . Entry < String , String > entry : exts . entrySet ( ) ) { ExtensionFileFilter filter = new ExtensionFileFilter ( entry . getKey ( ) , entry . getValue ( ) ) ; filters . put ( entry . getKey ( ) , filter ) ; chooser . addChoosableFileFilter ( filter ) ; } return filters ; }
adds the filters for the extensions to the provided chooser .
