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Enum是enumeration(列举)的简写形式,包含在java.lang包中。熟悉C, C++, C#, 或 Pascal人应该对列举有所了解,先看个例子: public enum Season { winter, spring, summer, fall } 一个enum是定义一组值的对象,它可以包括零个或多个值成员。它是属于enum类型的,一个enum对象中不可有两个或多个相同的属性或值。在次之前的java程序员一般是 用接口的方法实现列举的,如 : public interface Season { static winter = 0; static spring = 1; //etc…… } 引入了enum的java的列举的编写方便了许多,只须定义一个enum型的对象。enum对象的值都回自动获得一个数字值,从0开始,依次递增。看一个比较简单的enum实现的例子: EnumDemo.java package.net.javagarage.enums; /* We can loop over the values we put into the enum using the values() method. Note that the enum Seasons is compiled into a separate unit, called EnumDemo$Seasons.class */ public class EnumDemo { /*declare the enum and add values to it. note that, like in C#, we don't use a ; to end this statement and we use commas to separate the values */ private enum Seasons { winter, spring, summer, fall } //list the values public static void main(String[] args) { for (Seasons s : Seasons.values()){ System.out.println(s); } } }运行上述代码你回得到 以下结果: winter spring summer fall