我正在尝试从对象数组中删除一个对象，但是我似乎无法让它正常工作。我是 java 新手，注意到你不能简单地对数组执行 .remove() 。我知道你可以使用ArrayList，但是有没有办法从java中的数组中删除元素？我知道从技术上讲你无法做到这一点，因为数组是固定长度的，所以我所做的是将值 null 分配给数组中的对象引用。这是可行的，但是当我打印数组时，我收到此错误。错误 java.lang.NullPointerException对象定义public class Dog {    //Iniatilising instance variables    private String name;    private String breed;    private Gender gender;    private int age;    ...测试类常量public class TestDog {//Create a constant value for MAXstatic final int MAX = 10;//Define a constant PROMPTstatic final String PROMPT = "---->";//Define a constant SPACESstatic final String SPACES = "     ";//String array of menu optionsstatic final String options[] = {"Add new Dog","Display details for a Dog",        "Update details for a Dog","List all Dogs","Delete all Dogs","Delete one Dog","Quit"};//Define a constant QUITstatic final int QUIT = options.length;//Create an array capable of managing up to MAX Dog instancesstatic Dog pets[] = new Dog[MAX];static Dog empty[] = new Dog[MAX];//Define a value 'count' to indicate number of objects in arraystatic int count = 0;//A menu titlestatic String title = "Dog Manager";//Define a menu using title & optionsstatic Menu myMenu = new Menu(title,options);//Define a Scannerstatic Scanner input = new Scanner(System.in);测试类删除方法    public static void deleteOneDog() {    System.out.println("\nOK - Delete one dog");    boolean noDogs = false;    if (count == 0) {        System.out.println(PROMPT+"Sorry, there are no dogs.");        noDogs = true;        }