private String formatArgs ( String format , Object ... args ) { if ( format != null ) { return String . format ( format , args ) ; } else { StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 , N = args . length ; i < N ; i ++ ) { if ( i != 0 ) { sb . append ( ", " ) ; } sb . append ( args [ i ] ) ; } return sb . toString ( ) ; } }
Format a string with arguments .