您不能像这样实例化枚举。你有2种可能性
1.Catalog c = Catalog.year2005;
2. 通过添加一个可以根据 code(integer value) 返回枚举的方法,对枚举进行以下更改。例如。
enum Catalog {
year2005(9),year2006(12),year2007(15),year2008(18),
year2009(21),year2010(23),year2011(25),year2012(28),
year2013(31),year2014(33),year2015(36),year2016(39),
year2017(42),year2018(45),year2019(48),year2020(51);
private int id;
Catalog(int c){
this.id=c;
}
static Map<Integer, Catalog> map = new HashMap<>();
static {
for (Catalog catalog : Catalog.values()) {
map.put(catalog.id, catalog);
}
}
public static Catalog getByCode(int code) {
return map.get(code);
}
}
然后像这样分配
Catalog c = Catalog.getByCode(9);