Java enum

bearjava

使用enum可以方便的替代常量类。
/**enum可以单独定义*/public enum Week {SUNDAY,MONDAY,TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY}
public class ENUMTest {/**enum也可以定义在class里面*/public enum Color{RED,ORANGLE,YELLO,GREEN,CYAN,BLUE,PURPLE}public static void main(String[] args){for(Week w:Week.values()){         /**ordinal()可以输出索引位置,第一个是0*/System.out.print(w+":"+w.ordinal()+", ");}System.out.println();for(Week w:EnumSet.range(Week.MONDAY,Week.SATURDAY)){System.out.print(w+":"+w.ordinal()+", ");}System.out.println();for(Color c:Color.values()){System.out.print(c+":"+c.ordinal()+", ");}System.out.println(Color.BLUE);}}