Thread: how do you change the datatype of an attribute from String to Array?

I'm having a difficulty. I want to modify an attribute's data type from String to Array.

{
    “id”: “trn:tarb:tradingpartner:uuid:00000464-fa72-49fe-b050-c4bf1cfd8259”,
    “partnerNumber”: “1098981”,
    “partnerName”: "AFLO ",
    “currencyCode”: “GBP”,
    “commercialPartnerStatus”: “Inactive”,
    “source”: {
        “id”: “STV0001$$”,
        “name”: “QS”
    },
    “corpCode”: “DR”,
    “subCorpCode”: “001”,
    “targetMarket”: “UK”
}

In the preceding one, I want to convert targetMarket from String to Array without affecting its name.

 “targetMarket”:[
    “UK”,
    “IN”
]

The issue is with the old data, which is in string format, and if I alter the attribute in java, I receive an error while retrieving data from the database. It cannot automatically cast from string to ArrayList. I saw a method on this page but I'm confused is it compatible here or not? https://www.scaler.com/topics/string-to-array-in-java/
As a result, I must first change the old data before changing the java code. It is also acceptable if data is null or removed after changing the object from string to array.

import java.util.*;
 
class StringtoCharArray {
 
  public static void main(String args[]) {
    String str = "Scaler"; // Given String
 
    // Creating array of string length
    char[] arr = new char[str.length()];
 
    // Copy character by character into array
    for (int j = 0; j < str.length(); j++) {
      arr[j] = str.charAt(j);
    }
 
    // Printing the character array
    for (char x : arr) {
      System.out.println(x);
    }
  }
}

String to char array in Java. This is the program they give.
just convert the string to int in java when you cast the str to int in Java. And try writing in, see if that works when using the program. String to char array.