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.
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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