question: public String toString ( ) { StringBuffer result = new StringBuffer ( ) ; result . append ( "[" ) ; int s1 = sizes . size ( ) ; for ( int i = 0 ; i < s1 ; ++ i ) { int s2 = sizes . get ( i ) ; result . append ( "[" ) ; for ( int j = 0 ; j < s2 ; ++ j ) { result . append ( vector [ i ] [ j ] ) ; if ( j + 1 < s2 ) result . append ( ", " ) ; } result . append ( "]" ) ; if ( i + 1 < s1 ) result . append ( ",\n " ) ; } result . append ( "]" ) ; return result . toString ( ) ; }
target:  Returns a text representation of this vector. 