我有一种情况中,我有播放器类型的射手,战士,和巫师。我应该在播放器类我用?类型或枚举一个字符串变量?为什么枚举,为什么常量字符串。请帮助的原因。
I have a scenario in which I have Player types ARCHER,WARRIOR, and sorcerer. What should I use in player class? A String variable for type or a Enum? Why enum and why Constant Strings. Please help with reasons.
假设你使用常量字符串(或 INT
值 - 这同样适用于他们):
Suppose you use constant strings (or int
values - the same goes for them):
// Constants for player types
public static final String ARCHER = "Archer";
public static final String WARRIOR = "Warrior";
// Constants for genders
public static final String MALE = "Male";
public static final String FEMALE = "Female";
那么你最终没有真正了解你的数据的类型 - 导致潜在的不正确code:
then you end up not really knowing the type of your data - leading to potentially incorrect code:
String playerType = Constants.MALE;
如果您使用枚举,这将最终为:
If you use enums, that would end up as:
// Compile-time error - incompatible types!
PlayerType playerType = Gender.MALE;
同样,枚举给受限制的组值:
Likewise, enums give a restricted set of values:
String playerType = "Fred"; // Hang on, that's not one we know about...
VS
PlayerType playerType = "Fred"; // Nope, that doesn't work. Bang!
此外,在Java中枚举可以具有与它们相关联的详细信息,并且也可以有行为。好多全面。
Additionally, enums in Java can have more information associated with them, and can also have behaviour. Much better all round.