java Enum樣本

package com.xx.tests;import java.util.HashMap;import java.util.Map;public enum Season {Spring {@Overridepublic String toString() {return "春天";}},Summer{@Overridepublic String toString() {return "夏天";}},Autumn{@Overridepublic String toString() {return "秋天";}},Winter{@Overridepublic String toString() {return "冬天";}};private static final Map<Integer,Season> lookup=new HashMap<Integer,Season>();static{for (Season se : Season.values()) {lookup.put(se.ordinal(), se);}}public static Season fromOrdinal(int idx){return lookup.get(idx);}}

　　

 

package com.xx.tests;import java.util.EnumSet;import org.junit.Test;public class TestSeason {@Testpublic void test() {Season sea = Season.Spring;System.out.println(sea);for (Season s : Season.values()) {System.out.println(s);System.out.println( s.ordinal());}System.out.println("########");Season s1 = Enum.valueOf(Season.class, "Spring");System.out.println(s1);System.out.println("########");System.out.println(Season.fromOrdinal(3));System.out.println("########");EnumSet<Season> es = EnumSet.allOf(Season.class);for (Season season : es) {System.out.println(season);}System.out.println("########");EnumSet<Season> es2= EnumSet.of(Season.Autumn, Season.Winter);for (Season season : es2) {System.out.println(season);}}}