帮助Java中的枚举
发布时间:2020-12-15 03:16:07 所属栏目:Java 来源:网络整理
导读:是否有可能让枚举更改其值(从内部)?也许更容易理解代码的含义: enum Rate { VeryBad(1),Bad(2),Average(3),Good(4),Excellent(5); private int rate; private Rate(int rate) { this.rate = rate; } public void increateRating() { //is it possible to m
是否有可能让枚举更改其值(从内部)?也许更容易理解代码的含义:
enum Rate { VeryBad(1),Bad(2),Average(3),Good(4),Excellent(5); private int rate; private Rate(int rate) { this.rate = rate; } public void increateRating() { //is it possible to make the enum variable increase? //this is,if right now this enum has as value Average,after calling this //method to have it change to Good? } } 这是我想要实现的目标: Rate rate = Rate.Average; System.out.println(rate); //prints Average; rate.increaseRating(); System.out.println(rate); //prints Good 谢谢 解决方法
是.你可以简单地打电话
rate = Rate.Good; 对于这个特定的情况.但我认为你真正想要的是继任功能. Here你是: public class EnumTest extends TestCase { private enum X { A,B,C; public X successor() { return values()[(ordinal() + 1) % values().length]; } }; public void testSuccessor() throws Exception { assertEquals(X.B,X.A.successor()); assertEquals(X.C,X.B.successor()); assertEquals(X.A,X.C.successor()); } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |