隐式超级构造函数。必须显式调用另一个构造函数

Question

我只是在我的课程中进行继承，这是我用它做的第一个错误。除了在错误部分中抛出标题的构造函数之外，大多数代码都在工作。

public class CellDoor extends CellPassage {

    // TODO: instance variable(s)!
    private String imageOpen,imageClosed;
    private boolean locked, occupied;
    private Item item;

    // Create a new cell in the dungeon with the specified image.
    // The CellDoor class represents an door that can be closed (locked) or open.
    // NOTE: an open door is allowed to hold an item (e.g. a gem or key).
    public CellDoor(String imageOpen, String imageClosed, boolean locked) {
        this.imageOpen = imageOpen;
        this.imageClosed = imageClosed;
        this.locked = locked;
    }

cellPassage构造函数是：

public CellPassage(String image) {
    this.image = image;
}

有人可以给我一些指示吗？

Answer 1

你可能在CellPassage类中有一个不是默认值的构造函数。这意味着Java无法通过调用默认的超级构造函数来创建CellDoor对象。您必须在构造函数体的第一行中添加super(...)，其中...是CellPassage类中构造函数的参数。

public CellDoor(String imageOpen, String imageClosed, boolean locked)
{
    super(imageOpen);
    this.imageOpen = imageOpen;
    this.imageClosed = imageClosed;
    this.locked = locked;
}

如果您提供类CellPassage中的代码，我们将很容易确定您应该如何编写CellDoor构造函数