Java 月份枚举

Question

大家好，我是 Java 新手，所以我不太了解，您能尽可能简单地帮助我吗？这是我的代码，我收到了关于月份(int)的错误，这意味着它无法导入库.

public enum Month {
    January(1), February(2), March(3), April(4),May(5),June(6), July(7), August(8), September(9), October(10),  November(11), December(12)
}

ERROR:Description Resource Path Location Type The constructor Month(int) is undefined Month.java /tb00594_comp1027_formative2/src/tb00594_comp1027_formative2 line 4 Java Problem

WARNING:Description Resource Path Location Type Build path specifies execution environment JavaSE-1.7. There are no JREs installed in the workspace that are strictly compatible with this environment. tb00594_comp1027_formative2 Build path JRE System Library Problem

所以如果你能尽快帮助我，我会很高兴的。

Answer 1

Enum 基本上是最后一组有效选项的声明(在您的情况下是几个月)。但它仍然是Java Class~Object。

您的错误字面意思是您缺少 Java 类的构造函数，而您想为每个枚举提供特定属性。我猜你想在日历中添加月份顺序。您需要做的只是声明类和枚举构造函数的属性。

public enum Month {
    JANUARY(1), FEBRUARY(2), MARCH(3), APRIL(4),MAY(5),JUNE(6), JULY(7), AUGUST(8), SEPTEMBER(9), OCTOBER(10),  NOVEMBER(11), DECEMBER(12);

    private int monthOrder;

    public Month (int monthOrder) {
        this.monthOrder = monthOrder;
    }

    public int getMonthOrder() {
        return this.monthOrder;
    }
 }