JDK1.5出来的东西，提供了一个更好的方式来定义常量．枚举也就是相当于java当中的一个类，一个类型．也可以在里面加入构造子，当必须定义为私有的．也可定义属性，方法如下：
/* * To change this template, choose Tools | Templates * and open the template in the editor. */package enumpkg;/** * * @author Administrator */public enum Action { SHOOT("SHOOT"),RUN("RUN"),TURNLEFT("TURNLEFT"),TURNRIGHT("TURNRIGHT"); private String description; private Action(String description) { this.description = description; } public String toString() { return description; }}
/* * To change this template, choose Tools | Templates * and open the template in the editor. */package enumpkg;/** * * @author Administrator */public class Do { public void doAction(Action action) { switch(action) { case SHOOT: System.out.println("do SHOOT"); break; case RUN: System.out.println("do RUN"); break; case TURNLEFT: System.out.println("do TURNLEFT"); break; case TURNRIGHT: System.out.println("do TURNRIGHT"); break; } }}
/* * To change this template, choose Tools | Templates * and open the template in the editor. */package enumpkg;/** * * @author Administrator */public class Main { /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Do dothing = new Do(); dothing.doAction(Action.SHOOT); dothing.doAction(Action.RUN); dothing.doAction(Action.TURNLEFT); dothing.doAction(Action.TURNRIGHT); Action walk=Action.valueOf("SHOOT"); dothing.doAction(walk); Action[] actions =Action.values(); for(Action a:actions) System.out.println(a.toString()); }}
