我如何在這段代碼中引用石頭的重量，以便我可以在我的unlockChest方法中使用它？我基本上試圖將用戶從對象 new Stone()) 輸入的權(quán)重相加，因此它 == 組合了用戶在 Chest() 構(gòu)造函數(shù)中輸入的值。我知道這是錯誤的，但我嘗試了 jar1.weight，它說它不是變量。public class Stone{    private String name;    private int weight;    public Stone()    {        System.out.print("Enter stone name: ");        name = Global.keyboard.nextLine();        System.out.print("Enter stone weight: ");        weight = Global.keyboard.nextInt();        Global.keyboard.nextLine();    }}public class Jar{    private int position;    private Stone stone;    public Jar()    {        position = 0;        stone = null;    }    public Jar(int initPos, Stone stone)    {        position = initPos;        this.stone = stone;    }public class Ground{    private Jar jar1;    private Jar jar2;    private Jar jar3;    private Player player;    private Chest chest;    public Ground()    {      player = new Player();      jar1 = new Jar(1, new Stone());      jar2 = new Jar(2, new Stone());      jar3 = new Jar(3, new Stone());      chest = new Chest()    }    public boolean ChestUnlocked()    {        if (jar1.weight + jar2.weight + jar3.weight == chest.combination) //the main problem         return true;        else         return false;    }public class Chest{    public int combination;    private int position;    private Jar jar1;    private Jar jar2;    private Jar jar3;    public Chest()    {        System.out.print("Enter chest combination (5-10): ");        combination = Global.keyboard.nextInt();        Global.keyboard.nextLine();        position = 4;        jar1 = new Jar(4, null);        jar2 = new Jar(4, null);        jar3 = new Jar(4, null);    }