public class Animal { String[] animals = {"dog", "cat", "bird", "fish"}; public void printAnimals() { for (String animal : animals) { System.out.println(animal); } }}public class Dog extends Animal { int[] nums = {1, 2, 3, 4}; public void printNums() { for (int num : nums) { System.out.println(num); } }}public class Main { public static void main(String[] args) { Dog dog = new Dog(); dog.printAnimals(); // 输出：dog cat bird fish dog.printNums(); // 输出：1 2 3 4 }}如果这个代码中的数组是在Main中建立该如何解决

可以将数组作为参数传递给Animal和Dog类的构造函数，并在构造函数中初始化数组。代码示例：

public class Animal {
    String[] animals;
    
    public Animal(String[] animals) {
        this.animals = animals;
    }
    
    public void printAnimals() {
        for (String animal : animals) {
            System.out.println(animal);
        }
    }
}

public class Dog extends Animal {
    int[] nums;
    
    public Dog(String[] animals, int[] nums) {
        super(animals);
        this.nums = nums;
    }
    
    public void printNums() {
        for (int num : nums) {
            System.out.println(num);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        String[] animals = {"dog", "cat", "bird", "fish"};
        int[] nums = {1, 2, 3, 4};
        Dog dog = new Dog(animals, nums);
        dog.printAnimals();
        dog.printNums();
    }
}

输出结果与原来的代码相同。