java 我可以在java中用变量命名数组吗？
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Can I name an array with a variable in java?
提问by Johny
for example I want to do this:
例如我想这样做：
String[] arraynames = new String[2];
arraynames[0] = "fruits";
arraynames[1] = "cars";
and now I don't know how to do this
现在我不知道该怎么做
String[] arraynames[0] = new String[100]; // ??????
so that I create a String array called fruits with 100 cells... I know this doesn't work but is there someway to do this?
所以我创建了一个名为 Fruits 的 String 数组，有 100 个单元格……我知道这行不通，但有什么办法可以做到这一点吗？
回答by Yanick Rochon
Use an HashMap
使用 HashMap
Example:
例子：
HashMap<String,String[]> arraynames = new HashMap<String,String[]>();
arraynames.put("fruits", new String[1000]);
// then simply access it with
arraynames.get("fruits")[0] = "fruit 1";
However, may I suggest you replace arrays with ArrayList?
但是，我可以建议您用 替换数组ArrayList吗？
HashMap<String,ArrayList<String>> arraynames = new HashMap<String,ArrayList<String>>();
arraynames.put("fruits", new ArrayList<String>());
// then simply access it with
arraynames.get("fruits").add("fruit 1");
** EDIT**
**编辑**
To have an array of floatvalues instead of strings
拥有一组float值而不是字符串
HashMap<String,ArrayList<Float>> arraynames = new HashMap<String,ArrayList<Float>>();
arraynames.put("fruits", new ArrayList<Float>());
// then simply access it with
arraynames.get("fruits").add(3.1415f);
回答by aperkins
So, you are looking for a doubly indexed array?
那么，您正在寻找一个双索引数组？
Something like:
就像是：
String[][] arraynames = String[2][100];
You have created an array of 2 arrays that contain 100 String elements each in this case.
在本例中，您创建了一个由 2 个数组组成的数组，每个数组包含 100 个字符串元素。
回答by stacker
I hope I get you right, you could something like this:
我希望我说得对，你可以是这样的：
ArrayList arraynames = new ArrayList();
arraynames.add("fruits");
arraynames.add("cars");
arraynames.set(0, new ArrayList(100) );
回答by CoolBeans
I am not quite clear on the second line of code here. You said you are trying to create a string array named fruits. This should suffice if I understood this right.
我不太清楚这里的第二行代码。您说您正在尝试创建一个名为fruits 的字符串数组。如果我理解正确，这应该就足够了。
String [] fruits = new String[100];
回答by Harima555
you should use a bi-dimensional array like this:
你应该使用这样的二维数组：
String[][] myData = new String[2][100];
now myData is an array with 2 elements, both of them are arrays of "100 cells", then you can use these 2 arrays as follows:
现在 myData 是一个包含 2 个元素的数组，它们都是“100 个单元格”的数组，那么您可以按如下方式使用这 2 个数组：
String[] fruits = myData[0];
String[] cars = myData[1];
fruits[0] = "peach";
cars[0] = "mustang";
回答by Emil
Using Guavalibrary:
使用番石榴库：
ListMultimap<String,String> mappedItems = ArrayListMultimap.create();
mappedItems.put("Fruits","Apple");
mappedItems.put("Fruits","Orange");
mappedItems.put("Fruits","Banana");
mappedItems.put("Cars", "BMW");
mappedItems.put("Cars","Ferrari");
System.out.println(mappedItems);
Output:
输出：
{Cars=[BMW, Ferrari], Fruits=[Apple, Orange, Banana]}
{汽车=[宝马，法拉利]，水果=[苹果，橙子，香蕉]}
回答by fastcodejava
You can use one of the following :
您可以使用以下方法之一：
String[][] arraynames = String[2][100];
Map<String, String[]> namesMap = new HashMap<String, String[]>();
List<List<String>> names = new ArrayList<ArrayList<String>()>>();
