（Java）修改公共静态变量

这里有点新

不管怎么说，我对Java还比较陌生，这些是uni的一些实践问题，我有一个问题。 我怎样才能使总储量不被外界改变。现在如果我说

黄金总储量=500

这会改变它的价值。 如何使其仅由构造函数更改值

我知道我可以让它私有化，但我希望它在API中

这是参考API

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谢谢

老实说，保密是解决这个问题的最好办法。这不是你想要的答案…但这是最好的解决方案

在文件中，总储量的字段详细信息为公共静态最终总储量。最后一个修饰符表示总储量为常数。要跟踪当前储备，您需要创建另一个变量，如下所示：

private static int CURRENT_RESERVES = TOTAL_RESERVES;

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然后用它减去重量并返回剩余的储量。

关于您指定的API，您的代码应该如下所示：

public class Gold {

    public static final int TOTAL_RESERVES = 100;

    private int weight;

    private static int remainingWeight;

    static {
        remainingWeight = TOTAL_RESERVES;
    }

    public Gold(int weight) {

        if (remainingWeight <= 0) {

            this.weight = 0;
            remainingWeight = 0;
        }

        else {
            if (weight >= 0) {
                if (weight > remaining())
                    this.weight = remaining();
                else
                    this.weight = weight;
            } else {
                this.weight = 0;
            }

            remainingWeight -= this.weight;
        }
    }

    public int getWeight() {
        return this.weight;
    }

    public static int remaining() {
        return remainingWeight;
    }

    @Override
    public String toString() {
        return "Weight = " + this.weight;
    }

    public static void main(String[] args) {

    }
}

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如果在整个宇宙中有一个字段是私有的，那么它就是Gold.TOTAL_RESERVES.Yes，这也是我的想法，但是API显示它也必须做Javadoc，所以它是公共的可以记录私有变量吗？这似乎是错误的。xD@Nesan为什么要使其静止？使用final并使其成为constant@Nesan在API中明确指定了声明：public static final int TOTAL_RESERVES，那么为什么要更改该声明呢？是的，我也这么认为，但API显示它也必须执行Javadoc，所以它是公共的=/但是剩余的不总是会返回100吗？嘿，谢谢你！顺便问一下，静态{remainingWeight=TOTAL_RESERVES；}到底做了什么？新语法对我来说。@Nesan是一个静态初始化块，你可以从这里学到更多：是的，这似乎是最合理的解决方案。我想用一个领域做这件事是不可能的。谢谢我明天和教授商量一下。

public class Gold {

    public static final int TOTAL_RESERVES = 100;

    private int weight;

    private static int remainingWeight;

    static {
        remainingWeight = TOTAL_RESERVES;
    }

    public Gold(int weight) {

        if (remainingWeight <= 0) {

            this.weight = 0;
            remainingWeight = 0;
        }

        else {
            if (weight >= 0) {
                if (weight > remaining())
                    this.weight = remaining();
                else
                    this.weight = weight;
            } else {
                this.weight = 0;
            }

            remainingWeight -= this.weight;
        }
    }

    public int getWeight() {
        return this.weight;
    }

    public static int remaining() {
        return remainingWeight;
    }

    @Override
    public String toString() {
        return "Weight = " + this.weight;
    }

    public static void main(String[] args) {

    }
}