1.用enum定义枚举类默认继承了java.lang.Enum类而不是继承了Object类。其中java.lang.Enum类实现了java.lang.Serializable和java.lang.Comparable两个接口
2.枚举类的构造函数只能使用private访问修饰符，如果省略了其构造器的访问控制符，则默认使用private修饰；
3.枚举类的所有实例必须在枚举类中显式列出，否则这个枚举类将永远都不能产生实例。列出这些实例时，系统会自动添加public static final修饰，无需程序员显式添加。
public enum Week { MON{ public String toLocaleString(){ return "星期一"; } },TUES{ public String toLocaleString(){ return "星期二"; } },WEB{ public String toLocaleString(){ return "星期三"; } },THUR{ public String toLocaleString(){ return "星期四"; } },FRI{ public String toLocaleString(){ return "星期五"; } },SAT{ public String toLocaleString(){ return "星期六"; } },SUN{ public String toLocaleString(){ return "星期日"; } }; public abstract String toLocaleString();}枚举的遍历
public class EnumTest { public static void main(String[] args){ for(Week w:Week.values()){ System.out.println(w); } }}枚举的常用方法
int compareTo方法
String name()返回枚举实例的名称
int ordinal() 返回枚举值在枚举中的索引
String toString()返回枚举的实例名称 比name更常用
public static valueOf()
public class EnumTest { public static void main(String[] args){ Week day =Week.FRI; System.out.println(day);//FRI System.out.println(day.name());//FRI System.out.println(day.ordinal());//4 System.out.println(Week.valueOf("SUN").toLocaleString());//星期日 System.out.println(Week.values().length);//7 获取枚举长度 }}枚举的构造函数
public enum Gender { MALE("男"),FEMALE("女"); private String name; private Gender(String name){ this.name =name; } public String getName(){ return this.name; } public String toString(){ String name = null; switch(this){ case MALE: name="男"; break; case FEMALE: name="女"; break; } return name; }}枚举的综合应用示例：交通灯
public enum Lamp { S2N("N2S","S2W",false),S2W("N2E","E2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false), N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false), S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true); private Lamp(String opposite,String next,boolean lighted){ this.opposite = opposite; this.next = next; this.lighted = lighted; } private boolean lighted; private String opposite; private String next; public boolean isLighted(){ return lighted; } public void light(){ this.lighted = true; if(opposite != null){ Lamp.valueOf(opposite).light(); } System.out.println(name() + " lamp is green，下面总共应该有6个方向能看到汽车穿过！"); } public Lamp blackOut(){ this.lighted = false; if(opposite != null){ Lamp.valueOf(opposite).blackOut(); } Lamp nextLamp= null; if(next != null){ nextLamp = Lamp.valueOf(next); System.out.println("绿灯从" + name() + "-------->切换为" + next); nextLamp.light(); } return nextLamp; } }以上就是java中枚举的详细使用介绍的内容，更多相关内容请关注PHP中文网（www.iotsi.net）！
