java - 制作对象数组

Question

我创建了一个名为 Fish 的类:

public class  Fish {

    private String species;
    private int size;

    //Constructor
    public Fish(int x, String s) {
        size = x;
        species = s;
    }

    public String getSpecies() { return species; }

    public int getSize() { return size; }

    public String toString() {
        return String.format("A %dcm %s", size, species);
    }
}

而且我还开始创建一个名为 pond 的类，该类旨在具有一个名为“fish”的属性，该属性包含一个 Fish 对象数组。我不确定该怎么做。到目前为止，这是我的尝试。我是

public class Pond {
    private int capacity;
    private Object[] fish; //This is what I am trying to initialize. list of Fish. 
    private int numFish;

    //Capacity Constructor 
    public Pond(int n, int c) {
        n = numFish;
        c = capacity; 
    }

    public int getNumFish() { return numFish; }

    public boolean isFull() {
        boolean isFull = false;
        if (numFish >= capacity) {
            isFull = true;
        }
        else {
            isFull = false;
        }
        return isFull;
    }

    public String toString() {
        return String.format("Pond with %d fish", numFish);
    }

    public void add(Fish aFish) {
        if (numFish <= capacity) {
            numFish += 1;
            fish.add Fish;
        }
        else {
            numFish += 0;
        }
    }
}

Answer 1

改变这个:

private Object[] fish;

如下:

private Fish[] fish;

即这些是鱼而不是普通鱼
各种物体(例如它们不是哺乳动物)。