question: public static String join ( Object ... array ) { if ( array == null ) { return null ; } if ( array . length == 0 ) { return StringPool . EMPTY ; } if ( array . length == 1 ) { return String . valueOf ( array [ 0 ] ) ; } final StringBuilder sb = new StringBuilder ( array . length * 16 ) ; for ( int i = 0 ; i < array . length ; i ++ ) { sb . append ( array [ i ] ) ; } return sb . toString ( ) ; }
target:  Joins an array of objects into one string without separators.