Can I name an array with a variable in java? [duplicate]

This qu开发者_运维知识库estion already has answers here: Assigning variables with dynamic names in Java (7 answers) Closed 3 years ago.

for example I want to do this:

String[] arraynames = new String[2];
arraynames[0] = "fruits";
arraynames[1] = "cars";

and now I don't know how to do this

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?

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Use an HashMap

Example:

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 ?

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 **

To have an array of float values instead of strings

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);

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So, you are looking for a doubly indexed array?

Something like:

String[][] arraynames = String[2][100];

You have created an array of 2 arrays that contain 100 String elements each in this case.

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I hope I get you right, you could something like this:

ArrayList arraynames = new ArrayList();

arraynames.add("fruits"); 
arraynames.add("cars");

arraynames.set(0, new ArrayList(100) );

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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.

String [] fruits = new String[100]; 

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you should use a bi-dimensional array like this:

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:

String[] fruits = myData[0];
String[] cars = myData[1];
fruits[0] = "peach";
cars[0] = "mustang";

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Using Guava library:

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:

{Cars=[BMW, Ferrari], Fruits=[Apple, Orange, Banana]}

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You can use one of the following :

String[][] arraynames = String[2][100];
Map<String, String[]> namesMap = new HashMap<String, String[]>();
List<List<String>> names = new ArrayList<ArrayList<String>()>>();