java枚举类型
public?class?TestEnum?{
????/*最普通的枚举*/
????public?enum?ColorSelect?{
????????red,?green,?yellow,?blue;????
????}
????/*?枚举也可以象一般的类一样添加方法和属性,你可以为它添加静态和非静态的属性或方法,这一切都象你在一般的类中做的那样.?*/
????public?enum?Season?{
????????//?枚举列表必须写在最前面，否则编译出错
????????winter,?spring,?summer,?fall;
????????private?final?static?String?location?=?"Phoenix";????????
????????public?static?Season?getBest()?{
????????????if?(location.equals("Phoenix"))
????????????????return?winter;
????????????else
????????????????return?summer;
????????}
????}
????/*还可以有构造方法*/
????public?enum?Temp?{
????????/*通过括号赋值,而且必须有带参构造器和一属性跟方法，否则编译出错
?????????*?赋值必须是都赋值或都不赋值，不能一部分赋值一部分不赋值
?????????*?如果不赋值则不能写构造器，赋值编译也出错*/
????????absoluteZero(-459),?freezing(32),boiling(212),?paperBurns(451);
????????
????????private?final?int?value;
????????public?int?getValue()?{
????????????return?value;
????????}
????????//构造器默认也只能是private, 从而保证构造函数只能在内部使用
????????Temp(int?value)?{
????????????this.value?=?value;
????????}
????}
????public?static?void?main(String[]?args)?{
????????/*
?????????*?枚举类型是一种类型，用于定义变量，以限制变量的赋值?赋值时通过"枚举名.值"来取得相关枚举中的值
?????????*/
????????ColorSelect?m?=?ColorSelect.blue;
????????switch?(m)?{
????????/*注意:枚举重写了ToString(),说以枚举变量的值是不带前缀的
??????????*所以为blue而非ColorSelect.blue
????????? */
?case?red:
????????????System.out.println("color?is?red");
????????????break;
????????case?green:
????????????System.out.println("color?is?green");
????????????break;
????????case?yellow:
????????????System.out.println("color?is?yellow");
????????????break;
????????case?blue:
????????????System.out.println("color?is?blue");
????????????break;
????????}
????????System.out.println("遍历ColorSelect中的值");
????????/*通过values()获得枚举值的数组*/
????????for?(ColorSelect?c?:?ColorSelect.values())?{
????????????System.out.println(c);
????????} ?
System.out.println("枚举ColorSelect中的值有："+ColorSelect.values().length+"个");
? /*ordinal()返回枚举值在枚举中的索引位置，从0开始*/
System.out.println(ColorSelect.red.ordinal());//0
System.out.println(ColorSelect.green.ordinal());//1
System.out.println(ColorSelect.yellow.ordinal());//2
System.out.println(ColorSelect.blue.ordinal());//3
/*枚举默认实现了java.lang.Comparable接口*/?
System.out.println(ColorSelect.red.compareTo(ColorSelect.green));
System.out.println(Season.getBest());
????????
????????for(Temp?t:Temp.values()){
????????????/*通过getValue()取得相关枚举的值*/
????????????System.out.println(t+"的值是"+t.getValue());
????????}
????}
}
