question: public int endObject ( ) { if ( vtable == null || ! nested ) throw new AssertionError ( "FlatBuffers: endObject called without startObject" ) ; addInt ( 0 ) ; int vtableloc = offset ( ) ; for ( int i = vtable_in_use - 1 ; i >= 0 ; i -- ) { short off = ( short ) ( vtable [ i ] != 0 ? vtableloc - vtable [ i ] : 0 ) ; addShort ( off ) ; } final int standard_fields = 2 ; addShort ( ( short ) ( vtableloc - object_start ) ) ; addShort ( ( short ) ( ( vtable_in_use + standard_fields ) * SIZEOF_SHORT ) ) ; int existing_vtable = 0 ; outer_loop : for ( int i = 0 ; i < num_vtables ; i ++ ) { int vt1 = bb . capacity ( ) - vtables [ i ] ; int vt2 = space ; short len = bb . getShort ( vt1 ) ; if ( len == bb . getShort ( vt2 ) ) { for ( int j = SIZEOF_SHORT ; j < len ; j += SIZEOF_SHORT ) { if ( bb . getShort ( vt1 + j ) != bb . getShort ( vt2 + j ) ) { continue outer_loop ; } } existing_vtable = vtables [ i ] ; break outer_loop ; } } if ( existing_vtable != 0 ) { space = bb . capacity ( ) - vtableloc ; bb . putInt ( space , existing_vtable - vtableloc ) ; } else { if ( num_vtables == vtables . length ) vtables = Arrays . copyOf ( vtables , num_vtables * 2 ) ; vtables [ num_vtables ++ ] = offset ( ) ; bb . putInt ( bb . capacity ( ) - vtableloc , offset ( ) - vtableloc ) ; } nested = false ; return vtableloc ; }
target:  Finish off writing the object that is under construction.