java - class.java 使用未经检查或不安全的操作

Question

我试图让我的 .jar 文件在我的 dist 文件夹中运行，但它没有运行，我尝试清理和构建并注意到它给出了消息:

Note: E:\ZombieDefense\src\GameScreen\ZombieDefense.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

经过一番搜索，我发现这可能与我在此类中声明一些变量有关？

无论如何，我无法找到问题所在，并且认为也许这里有人可以看到它，谢谢

public class ZombieDefense extends JComponent implements Runnable   {

    //private Zombie zombie = new Zombie(this);
    private ImageIcon background = new ImageIcon(getClass().getResource("background.jpg"));
    protected Survivor survivor = new Survivor();
    private Barricade barricade = new Barricade();
    private GameScreen framePointer;
    protected ArrayList<Zombie> zombieArray = new ArrayList();
    protected ArrayList<Bullet> bulletArray = new ArrayList();
    Scanner in = new Scanner(System.in);
    Random random = new Random();
    Thread timer = new Thread(this);
    int currzomb = 0;
    int maxzomb = 10;
    int wave = 1;
    int kills = 0;
    int totalzomb = 10;
    int threadint = 2000;
    String name;
    Stopwatch time;

如果它与声明以外的其他事情有关，请告诉我，我将编辑并弹出代码，再次感谢

Answer 1

protected ArrayList<Zombie> zombieArray = new ArrayList<Zombie>();
protected ArrayList<Bullet> bulletArray = new ArrayList<Bullet>();