小编WYW*_*WYW的帖子

public class Pot {
    public String shape;
    private int capacity;
    public ArrayList<Flower> flowers = new ArrayList<Flower>();
    public int free_space = capacity - flowers.size(); // why doesn't free_space work?

    public Pot(String shape, int capacity) {
        this.shape = shape;
        this.capacity = capacity;
        System.out.println(capacity); // test
        System.out.println(flowers.size()); // test
        System.out.println(free_space); //test
    }
    
    ....
}

嗨，为什么我无法获得正确的 free_space？它总是 0。我发现这free_space = capacity - flowers.size()不起作用。

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public static void main(String[] args) {
            Pot p = new Pot("square", 8);
            Flower f = new Flower(....);
            .....
            Flower …