Java - 数组中的对象被覆盖

Question

目前我有以下代码（类Car和一个名为test的临时类来测试前者：

class test {
    public static void main(String[] args) {
        Car[][] volvo = new Car[3][3];
        volvo[0][0] = new Car(300, 200);
        volvo[0][1] = new Car(250, 250);

        System.out.println("Car 1 Weight/Height" + volvo[0][0].returnSize() + "/" + volvo[0][0].returnWeight());
        System.out.println("Car 2 Weight/Height" + volvo[0][1].returnSize() + "/" + volvo[0][1].returnWeight());
    }
}

class Car {
    private static int size;
    private static int weight;

    Car(int carSize, int carWeight) {
        size = carSize;
        weight = carWeight;
    }

    public static int returnSize() {
        return size;
    }

    public static int returnWeight() {
        return weight;
    }
}

我从前面提到的片段获得的输出：

Car 1 Weight/Height250/250
Car 2 Weight/Height250/250

我真的希望得到的输出：

Car 1 Weight/Height300/200
Car 2 Weight/Height250/250

有没有理由为第一个创建的对象（new Car(300, 200)）被第二个对象完全覆盖，有没有办法解决这个问题？