枚舉（enum），是定義了一組排過序的單一實例的列表。spa
// 定義一個枚舉 public enum Season { SPRING,SUMMER,AUTUMN,WINTER; }
反編譯代碼後能夠發現，上述代碼能夠等價於code
public final class Season extends Enum { public static final Season SPRING; public static final Season SUMMER; public static final Season AUTUMN; public static final Season WINTER; private static final Season ENUM$VALUES[]; static { SPRING = new Season("SPRING", 0); SUMMER = new Season("SUMMER", 1); AUTUMN = new Season("AUTUMN", 2); WINTER = new Season("WINTER", 3); ENUM$VALUES = (new Season[] { SPRING, SUMMER, AUTUMN, WINTER }); } }
使用方式blog
System.out.println(Season.AUTUMN);
輸出結果爲：AUTUMN編譯