枚举类型的使用

如何使用枚举类：

 

通常的方式是直接定义一个枚举类，但是如果想一个类定义多个枚举类，可以考虑将枚举类定义为内部类来实现例如：

 

 

 

public class BabyConstants {


	public static final int BABY_SEX_BOY = 1;
	public static final int BABY_SEX_GIRL = 2;
	public static final int BABY_SEX_BOYANDGIRL = 3;
	public enum BabySex{
		BOY(1, "男"),
		GIRL(2, "女");
		BabySex(int value, String meaning) {
			this.value = value;
			this.meaning = meaning;
		}

		private final int value;
		private final String meaning;

		public int getValue() {
			return this.value;
		}

		public String getMeaning() {
			return this.meaning;
		}

		public static BabySex valueOf(int value) {
			for (BabySex e : BabySex.values()) {
				if (e.getValue() == value) {
					return e;
				}
			}
			return null;
		}
	}
	public enum Constellation{
		BAIYANGZUO(1, "白羊座"),
		JINNIUZUO(2, "金牛座"),
		SHUANGZIZUO(3, "双子座"),
		JUXIEZUO(4,"巨蟹座"),
		SHIZIZUO(5,"狮子座"),
		CHUNVZUO(6,"处女座"),
		TIANCHENGZUO(7,"天秤座"),
		TIANXIEZUO(8,"天蝎座"),
		SHESHOUZUO(9,"射手座"),
		MOJIEZUO(10,"魔羯座"),
		SHUIPINGZUO(11,"水瓶座"),
		SHUANGYUZUO(12,"双鱼座");
		Constellation(int value, String meaning) {
			this.value = value;
			this.meaning = meaning;
		}

		private final int value;
		private final String meaning;

		public int getValue() {
			return this.value;
		}

		public String getMeaning() {
			return this.meaning;
		}

		public static Constellation valueOf(int value) {
			for (Constellation e : Constellation.values()) {
				if (e.getValue() == value) {
					return e;
				}
			}
			return null;
		}
	}
	public enum Animal {
		SHU(1, "鼠"),
		NIU(2, "牛"),
		HU(3, "虎"),
		TU(4,"兔"),
		LONG(5,"龙"),
		SHE(6,"蛇"),
		MA(7,"马"),
		YANG(8,"羊"),
		HOU(9,"猴"),
		JI(10,"鸡"),
		GOU(11,"狗"),
		ZHU(12,"猪");
		Animal(int value, String meaning) {
			this.value = value;
			this.meaning = meaning;
		}

		private final int value;
		private final String meaning;

		public int getValue() {
			return this.value;
		}

		public String getMeaning() {
			return this.meaning;
		}

		public static Animal valueOf(int value) {
			for (Animal e : Animal.values()) {
				if (e.getValue() == value) {
					return e;
				}
			}
			return null;
		}
	}
	
}

 本段代码中既有不可变常量定义的性别，也有通过枚举定义的性别，就平时使用来说还是推荐使用枚举类型