Separate the Digits in an Array

Given an array of positive integers nums, return an array answer that consists of the digits of each integer in nums after separating them in the same order they appear in nums.

To separate the digits of an integer is to get all the digits it has in the same order.

• For example, for the integer 10921, the separation of its digits is [1,0,9,2,1].

LeetCode Problem - 2553

class Solution {
    public int[] separateDigits(int[] nums) {
        // Create a StringBuilder to concatenate all the digits
        StringBuilder sb = new StringBuilder();

        // Concatenate each number in the array to the StringBuilder
        for(int num : nums){
            sb.append(num);
        }

        // Convert the StringBuilder to a String
        String newStr = sb.toString();

        // Create an integer array to store the separated digits
        int[] result = new int[newStr.length()];

        // Iterate through each character in the string
        for(int i=0; i<newStr.length(); i++){
            // Convert the character to its numeric value and store it in the result array
            result[i] = Character.getNumericValue(newStr.charAt(i));
        }

        // Return the array containing separated digits
        return result;
    }
}