private ArrayList<Card> cardList = new ArrayList<Card>();如何在cardList中添加card的关联类Shape类的对象

可以通过在Card类的构造函数中接受Shape类的对象作为参数，并在构造函数内将其保存到Card类的成员变量中，然后在向cardList中添加Card对象时，传递Shape对象作为参数即可。具体实现可以参考以下代码：

public class Card {
    private Shape shape;

    public Card(Shape shape) {
        this.shape = shape;
    }

    // getter and setter methods for shape

    // other methods for Card class
}

public class Shape {
    // fields, methods, constructors for Shape class
}

// create a Shape object
Shape shape = new Shape();

// create a Card object using the Shape object
Card card = new Card(shape);

// add the Card object to the cardList
cardList.add(card);