java 将枚举类型添加到列表
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Adding enum type to a list
提问by Victor
If I need to add an enum attribute to a list, how do I declare the list? Let us say the enum class is:
如果我需要向列表添加枚举属性,我该如何声明该列表?让我们说枚举类是:
public enum Country{ USA, CANADA; }
I want to do:
我想要做:
List<String> l = new ArrayList<>();
l.add(Country.USA);
What needs to be used instead of List<String>?
需要用什么代替 List<String>?
回答by MByD
Should be:
应该:
List<Country> l = new ArrayList<Country>();
l.add(Country.USA); // That one's for you Code Monkey :)
回答by timaschew
If you want the string type use this:
如果你想要字符串类型使用这个:
l.add(Country.USA.name());
l.add(Country.USA.name());
otherwise the answer of MByD
否则MByD的答案
回答by Bohemian
If you want to hold anyenum, use this:
如果要保留任何枚举,请使用以下命令:
List<? extends Enum<?>> list = new ArrayList<Country>();
Enum<?> someEnumValue = list.get(0); // Elements can be assigned to Enum<?>
System.out.println(someEnumValue.name()); // You can now access enum methods