Different Ways to Generate String by using Characters and Numbers in Java

// Java program to generate String by using
// Strings and numbers
class GFG {

    // Function to generate the new String
    public static String generateNewString(String str,
                                           int num)
    {
        // Initialize a variable that
        // stores the final answer.
        String finalAnswer = "";

        String answer = "";

        // Converting the given numbers
        // into string
        String index = String.valueOf(num);

        // Traverse the loop from start to end
        for (int i = 0; i < index.length(); i++) {

            // Getting last digit of numbers
            int k = num % 10;

            // Adding kth position character
            // into the variable answer
            answer = answer + str.charAt(k);
            num = num / 10;
        }

        // Traverse the loop in reverse order
        for (int j = answer.length() - 1; j >= 0; j--) {

            // Adding jth position character
            // into the variable finalAnswer
            finalAnswer = finalAnswer + answer.charAt(j);
        }

        // Return the finalAnswer
        return finalAnswer;
    }

    // Driver Code
    public static void main(String args[])
    {

        // Given String str
        String str = "GeeksforGeeks";

        // Given Number num
        int num = 858;

        // Printing the result
        System.out.println(generateNewString(str, num));
    }
}

// Java program to generate String by using
// Strings and numbers
class GFG {

    // Function to generate the new String
    public static String generateNewString(String str,
                                           int num)
    {
        // Initialize a variable that
        // stores the result.
        String result = "";

        // Converting the given numbers
        // into the string
        String index = String.valueOf(num);

        // Traverse the loop from start to end
        for (int i = 0; i < index.length(); i++) {

            // Getting the right index
            int k = index.charAt(i) - 48;

            // Adding kth position character
            // into the result
            result = result + str.charAt(k);
        }

        // Return result
        return result;
    }

    // Driver Code
    public static void main(String args[])
    {

        // Given String str
        String str = "GeeksforGeeks";

        // Given Number num
        int num = 858;

        // Printing the result
        System.out.println(generateNewString(str, num));
    }
}