car[] = new car[100];
//populate car array...
String[] mySelectedCarAttributes = new String[];
mySelectedCarAttributes[0]=car.attribute1 //attributes are ints
mySelectedCarAttributes[1]=car.attribute2
mySelectedCarAttributes[2]=car.attribute3
mySelectedCarAttributes[3]=car.attribute4

// the content of mySelectedCarAttributes would be
// dynamically changed by user interaction, so for example:
mySelectedCarAttributes[3]=car.attribute8

for (int i=0;i>car.length;i++){
int calcScore = car[i].mySelectedCarAttributes[0]+
                car[i].mySelectedCarAttributes[1]+
                car[i].mySelectedCarAttributes[2]+
                car[i].mySelectedCarAttributes[3];