Using objects in a subclass java

Question

I want to use objects that I've declared in one class in a subclass but it gives me non-static variable cannot be referenced from static context I'm a beginner with this so what can I change to make this work

class PairofDice {
    int d61;
    int d62;
    PairofDice d1 = new PairofDice();
    PairofDice d2 = new PairofDice();

    class BoxCars {
    public static void main(String[] args) {
        roll();
        Random rand = new Random();

        int BC = 0;
        for (int i = 0; i < 1000; i++) {
            d1.d61 = rand.nextInt(6 + 1 - 1) + 1;
            d2.d62 = rand.nextInt(6 + 1 - 1) + 1;
            if (d1.d61 + d2.d62 == 12) {
                BC++;
            }
        }

        }
    }
}

(ignore the roll method it's a part of something else)

Answer 1

Move your dice instances below as shown. And subtracting 1 and adding 1 in the same nextInt() call doesn't make sense. As there are other questionable constructs in your code, a better question might have been to ask for help in achieving the end goal.

public class PairofDice {
    int d61;
    int d62;

    class BoxCars {
    public static void main(String[] args) {
//        roll();
        
        Random rand = new Random();
        PairofDice d1 = new PairofDice();
        PairofDice d2 = new PairofDice();

        int BC = 0;
        for (int i = 0; i < 1000; i++) {
            d1.d61 = rand.nextInt(6 + 1 - 1) + 1;
            d2.d62 = rand.nextInt(6 + 1 - 1) + 1;
            if (d1.d61 + d2.d62 == 12) {
                BC++;
            }
        }

        }
    }
}

Answer 2

您是否尝试过将内部类设为静态？