英文:
How to get a array by variable? (Java)
问题
以下是您要翻译的代码部分：
我有一堆数组
static String[] Laura= {"Female", "Blond"};
static String[] Phil= {"Male", "Brunette"};
static String[] Mark= {"Male", "Brown"};
static String[] Person= {"Gender", "Haircolor"};
我想根据用户输入替换占位符"person"，使用数组2-4中的内容。
简而言之：
我想通过将用户输入的名称作为字符串来访问一个数组，并替换我的"person"数组。
所以像这样：
`person[1] = "Laura"[1]`
我有大约150个不同的数组，为此而编写150个代码片段似乎不合理，肯定有更简单的方法。 （这可能非常简单，只是我目前无法想到。）
我尝试将我的变量放在通常应该是数组名称的地方，但出现了语法错误。
我尝试过：
`person[1] = variable[1]`
英文:
I have a bunch of Arrays
static String[] Laura= {"Female", "Blond"};
static String[] Phil= {"Male", "Brunette"};
static String[] Mark= {"Male", "brown"};
static String[] Person= {"Gender", "Haircolor"};
and I want to replace the placeholder person with content from the arrays 2-4, depending on user input.
In short:
I want to acces an array by giving the name as a String that the user inputs and replace my person array.
so something like this:
person[1] ="Laura"[1]
I have about 150 different arrays, and having 150 code snippets just for this seems unreasonable to me, there has to be a way. (Its probably really simple I just cant think of it at the moment)
I tried just putting my variable in the place where the Array's name would usually be, but its a Syntax error.
I tried:
person[1] = variable[1]
答案1
得分: 1
变量名在编译后不会保留，至少不能以可用的方式保留。因此，直接回答你的问题：不可能。
鉴于这一点，Java程序员通常不会做你所做的事情。相反，他们会创建一个Map，将字符串（比如Laura）映射到值（比如new String[] {"Female", "Blond"}）。
实际上，顺便说一下，Java程序员不会将这样的数据存储在字符串数组中，他们会创建类型，例如：
enum HairColor {
BROWN, BLONDE, OTHER;
}
enum Gender {
MALE, FEMALE, OTHER;
}
record Person(Gender gender, HairColor hairColor) {}
然后，你可以有一个Map<String, Person>，将一个人的名字（"Laura"）映射到表示她的Person实例。
然后，你可以执行person[1] = "Laura"[1]，如下所示：
Person p = persons.get("Laura");
然后继续操作。要创建这个映射，你可以用以下代码替换：
String[] laura = {"Female", "Blonde"};
// 替换为
Map<String, Person> persons = new HashMap<>();
persons.put("Laura", new Person(Gender.FEMALE, HairColor.BLONDE));
英文:
Variable names do not survive compilation, at least, not in a usable way. Thus, to directly answer your question: impossible.
Given that it is, java programmers tend not to do what you're doing. Instead, they'd make a Map that maps strings (such as Laura) onto values (such as new String[] {"Female", "Blond"}`).
Actually, while we're at it, a java programmer would never store such data in a string array, they'd make types, such as:
enum HairColor {
BROWN, BLONDE, OTHER;
}
enum Gender {
MALE, FEMALE, OTHER;
}
record Person(Gender gender, HairColor hairColor) {}
Then you'd have a Map<String, Person> that maps the name of a person ("Laura") to an instance of Person representing her.
Then you can do your person[1] ="Laura"[1] as:
Person p = persons.get("Laura");
and go from there. To make this map, you replace:
String[] laura = {"Female", "Blonde"};
// with
Map<String, Person> persons = new HashMap<>();
persons.put("Laura", new Person(Gender.FEMALE, HairColor.BLONDE));
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