Insert dynamic data into 2D array of strings

Question

I am trying to make a catalog for a shop. For that I have a 2D array:

String childElements[][] = new String[][];

I want to add data into this array. The data is another array:

ArrayList<String> names = new ArrayList<String>();

names can vary depending on the input that I get.

For example if it is a furniture store, the categories will be Tables, Chairs etc.

I have my categories stored in another array which is something like:

String groupElements[] = {"Tables", "Chairs"};

And names contains: {"Wood", "Metal", "4-seater", "6-seater"}

So, I want the childElements array to reflect it like:

childElements = ["Chairs"]["Wood", "Metal"]
                ["Tables"]["4-seater"]["6-seater"]

So how do I insert the data to serve my needs?

I would like to stick with an array of arrays and not go for list or a hashmap as the architecture depends on that.

You're trying to convert a one-dimensional datatype (ArrayList<String>) into a two-dimensional datatype. You need to be more clear as to how you wish to format the resulting array. — SamTebbs33
– SamTebbs33, Commented May 15, 2015 at 8:09
String childElements = new String[][]; is not a valid syntax — Ankur Anand
– Ankur Anand, Commented May 15, 2015 at 8:14

user987339 · Accepted Answer · 2015-05-15 08:18:09Z

As @Dude suggested use HashMap, it will help you to organise things easier. So in your case category will be the key and the value will be the array.

    // create map to store
    Map<String, List<String>> map = new HashMap<String, List<String>>();


    // create list one and store values
    List<String> chairs = new ArrayList<String>();
    chairs.add("Wood");
    chairs.add("Metal");

    // create list two and store values
    List<String> tables = new ArrayList<String>();
    tables.add("4-seater");
    tables.add("6-seater");

    // put values into map
    map.put("Chairs", chairs);
    map.put("Tables", tables);

    // iterate and display values
    System.out.println("Fetching Keys and corresponding [Multiple] Values");
    for (Map.Entry<String, List<String>> entry : map.entrySet()) {
        String key = entry.getKey();
        List<String> values = entry.getValue();
        System.out.println("Key = " + key);
        System.out.println("Values = " + values);
    }

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