You can use the GSON library to accomplish this.

 ArrayList<String> mylist = new ArrayList<String> ();
 mylist.add("abc");
 mylist.add("cfd");
 mylist.add("ert");
 mylist.add("fg");
 mylist.add("ujk");
 String json = new Gson().toJson(mylist);

You can refer to the GSON User Guide for more support.

Not sure if it's exactly what you need, but you can use the GSON library (Link) for ArrayList to JSON conversion.

ArrayList<String> list = new ArrayList<String>();
list.add("str1");
list.add("str2");
list.add("str3");
String json = new Gson().toJson(list);

Or in your case:

ArrayList<Domain> list = new ArrayList<Domain>();
list.add(new Domain());
list.add(new Domain());
list.add(new Domain());
String json = new Gson().toJson(list);

If for some reason you find it more convenient, you can also iterate through the ArrayList and build a JSON from individual Domain objects in the list

String toJSON(ArrayList<Domain> list) {
    Gson gson = new Gson();
    StringBuilder sb = new StringBuilder();
    for(Domain d : list) {
        sb.append(gson.toJson(d));
    }
    return sb.toString();
}

If I read the JSONArray constructors correctly, you can build them from any Collection (arrayList is a subclass of Collection) like so:

ArrayList<String> list = new ArrayList<String>();
list.add("foo");
list.add("baar");
JSONArray jsArray = new JSONArray(list);

References:

• jsonarray constructor: http://developer.android.com/reference/org/json/JSONArray.html#JSONArray%28java.util.Collection%29
• collection: http://developer.android.com/reference/java/util/Collection.html

Your description doesn't match your post title. What is your actual question?

Both Powershell and JSON don't particularly care about the structure of your data. In PS you can have an array of various objects (it sees everything as object anyway) and JSON allows for optional fields so the missing fields in the first value won't impact the structure.

# Using a hash object here for convenience
$item1 = @{ basePrice = 100; category = "some category"; packageWeightUnit = "g"; productType = "Some type" }
$item2 = @{ basePrice = 100; category = "some category"; packageWeightUnit = "g"; productType = "Some type"; attributes = @{ colour = @("blue", "red"); hight = @(100) } } 

# Assuming you have more items than this...
$list = New-Object System.Collections.ArrayList
$list += $item1
$list += $item2
ConvertTo-Json $list -depth 4

To go the other way, given the previous JSON

$readItems = ConvertFrom-Json $json

If you want or need to work with a Java array then you can always use the java.util.Arrays utility classes' static asList() method to convert your array to a List.

Something along those lines should work.

String mStringArray[] = { "String1", "String2" };

JSONArray mJSONArray = new JSONArray(Arrays.asList(mStringArray));

Beware that code is written offhand so consider it pseudo-code.

To convert ArrayList to Json, just download Open Source json utility from: http://json.org/java/ or Jar file from here

And just do:

JSONArray jsonAraay = new JSONArray(your_array_list);

That's it

Note: You should have setter/getter in your POJO/MODEL class to convert arraylist to json

You coud use Gson library, that handles lists properly, instead.

Usage example:

class BagOfPrimitives {
    private int value1;
    private String value2;
    private transient int value3;
    public BagOfPrimitives(int value1, String value2, int value3) {
        this.value1 = value1;
        this.value2 = value2;
        this.value3 = value3;
    }
}

BagOfPrimitives obj1 = new BagOfPrimitives(1, "abc", 3);
BagOfPrimitives obj2 = new BagOfPrimitives(32, "gawk", 500);
List<BagOfPrimitives> list = Arrays.asList(obj1, obj2);
Gson gson = new Gson();
String json = gson.toJson(list);  
// Now json is [{"value1":1,"value2":"abc"},{"value1":32,"value2":"gawk"}]