如何跟踪哪个对象属于哪个对象？

Question

Disclaimer: This is a school project but Prof said it's ok to ask for help.

The project is to simulate a traffic grid. The part I'm working on is keeping track of what car is on what road. A road is an array list containing cars. I've made a road handler (an array list) that contains all roads.

public void checkPositionOnRoad(){
    if(this.getPosition() > RoadHandler.currentRoad.getLength()-this.getCarLength()){
        RoadHandler.currentRoad.remove(this);
        Road nextRoad = moveToNextRoad(RoadHandler.currentRoad);
        nextRoad.accept(this);
    }
}

The problem is that I don't know how to keep track of "currentRoad". Getting the next road is easy enough because I can just say

nextroad(Road currentRoad); 

where I just grab the currentRoad's index+1.

The end goal is for the car to finish it's road and move on to the next one in the array of roads which RoadHandler keeps track off. So while the car runs it checks to see where its on in the road. Once it finishes it's road it takes itself out of the current Road and adds itself to the next one.

public void run(double time) {
    checkPositionOnRoad();
    position += velocity;
}

Also I want to reset the car's position on the new road. The checkPositionOnRoad and run methods are in the Car class and the nextRoad method is in the RoadHandler class.

Answer 1

Easy. Create a POJO class to represent you cars objects. And create an attribute in that class called currentRoad. Like this

String currenRoad;

The current road attribute should be changed each time you car enter to a new road. it implies that you need to create a POJO class to represent you road objects. Always remember design you problem before do coding