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());
}
}