69 Java 枚举类

来源：互联网发布：成都网络作家吸毒编辑：程序博客网时间：2024/05/06 03:24
package new20140517;/** * 枚举类 * ——实例有限且固定的类 * 手动实现枚举类 * ——通过private将构造器隐藏起来 * ——吧这个类的所有可能实例都使用public static final 修饰的类变量来保存 * -可以提供一些静态方法，其他程序根据特定参数来获取与之匹配的实例 * @author x * */ class Season {//把Season类定义成不可变的，将其Field也定义成finalprivate final String name;private final String desc;public static final Season SPRING=new Season("春天","春暖花开" );public static final Season SUMMER=new Season("夏天","夏日炎炎" );public static final Season AUTUMN=new Season("秋天","秋高气爽" );public static final Season WINNER=new Season("冬天","围炉赏雪" );public static Season getSeason(int seasonNum){switch (seasonNum) {case 1:return SPRING;case 2:return SUMMER;case 3:return AUTUMN;case 4:return WINNER;default:return null;}}//将构造器定义成private访问权限private Season(String name, String desc){this.name=name;this.desc=desc;}//只为name和desc提供getter方法public String getName() {return name;}public String getDesc() {return desc;}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stub//调用方法Season s1=Season.WINNER;Season s2=Season.getSeason(1);System.out.println(s2.getName());}}
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