Java从另一个类获取对象列表

Question

I'm having two classes : WorldOfRobots and Robot (abstract). Both are public. World of robots is basically an arraylist of Robot. Then I have a class telebot which is an extension of Robot. I'm trying to build a method in the class Telebot which will identify and get the list of robots where the current object Telebot is. For example: I create 2 World of Robots (wor1 and wor2) and then 1 telebot (r1). I add r1 in wor1. I'd like to get a way to get the list of robots of wor1 in a method of the class telebot.

Here is a bit of code.

abstract class Robot {
// content
}

public class Telebot extends Robot
{
    // instance variables - replace the example below with your own
    private WorldOfRobots wor;

    public Telebot(String newName, String newDirection)
    {
        super(newName, newDirection);
    }

    public void something {

        // here I'm trying to get the list
        wor = new WorldOfRobots();
        ArrayList<Robot> robots = wor.getList();
        // Unfortunately this solution doesn't work cause I'm creating a new WOR. What I want is to get the WOR where the Telebot belong.
    }

}

public class WorldOfRobots {

// List of robots
private ArrayList<Robot> robots;

    public WorldOfRobots() {
    robots = new ArrayList<Robot>();
    }

    public ArrayList<Robot> getList() {
        return robots;
    }

}

Thanks for your help.

Answer 1

You can refactor your class to something like this ...

public class Telebot extends Robot {

//your code and constructer here

public void something(WorldofRobots container){
  //this is the list containing your instance of telerobot, use it as you like
}

}

Now from outside classes you can invoke robotInstance.something(listOfRobot); I am not sure how your classes are exactly interacting so I cannot expand on using this method more.

Answer 2

abstract class Robot {
private WorldOfRobots world;

public void setWorld(WorldOfRobots world)
{
    this.world=world;
}
// content
}

public class Telebot extends Robot
{
    public Telebot(String newName, String newDirection)
    {
        super(newName, newDirection);
    }   
    public void doSomething()
    {
        world.doSomethingElse();
    }

}

public class WorldOfRobots {

// List of robots
private ArrayList<Robot> robots;

    public WorldOfRobots() {
    robots = new ArrayList<Robot>();
    }
    public void addRobot(Robot robot)
    {
        robots.add(robot);
        robot.setWorld(this);
    }

}

Storing a reference for the WorldOfRobots in the Robot class is reasonable in this case. If you want a robot to belong to multiple WorldOfRobots then change the world varible to List.