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class FreshJuice {// 枚举：当做数据类型，只能接固定值（定义值）
enum FreshJuiceSize{
SMALL,
MEDIUM,
LARGE
}FreshJuiceSize size;
// size 是类FreshJuice的实体变量
}public class FreshJuiceTest {public static void main(String args[]){FreshJuice juice = new FreshJuice();
// 类.枚举名.枚举值
juice.size = FreshJuice.FreshJuiceSize.MEDIUM;
System.out.println("Size: " + juice.size);
if (juice.size == FreshJuice.FreshJuiceSize.MEDIUM) {
System.out.println("显示中杯页面");
}else if (juice.size == FreshJuice.FreshJuiceSize.SMALL) {
System.out.println("显示小杯页面");
}else if (juice.size == FreshJuice.FreshJuiceSize.LARGE) {
System.out.println("显示大杯页面");
}}
}
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