question: public String toString ( ) { final StringBuilder buf = new StringBuilder ( "{" ) ; for ( int i = 0 , end = _pos - 1 ; i < end ; i ++ ) { buf . append ( _data [ i ] ) ; buf . append ( ", " ) ; } if ( size ( ) > 0 ) { buf . append ( _data [ _pos - 1 ] ) ; } buf . append ( "}" ) ; return buf . toString ( ) ; }
target:  Returns a String representation of the list, front to back.