Question

How to convert an int number into an array of int digits in Java

Answer 1

public class Main {
    static int[] intNumberIntoIntDigitsArray(int number) { 
        String numberStr = Integer.toString(number);
        int[] digits = new int[numberStr.length()];
            
        for (int i = 0; i < numberStr.length(); i++) {
            digits[i] = Character.getNumericValue(numberStr.charAt(i));
        }
       
        return digits;
    } 
    public static void main(String[] args) {
        int number = 12345;
        int[] digits = intNumberIntoIntDigitsArray(number);

        for (int digit : digits) {
            System.out.print(digit + " ");
        }
    }
}

   
   
/*
run:
   
1 2 3 4 5 
   
*/

 

70+ SQL courses for beginners and professionals

Answer 2

import java.util.ArrayList;
import java.util.Collections;

public class Main {
    static int[] intNumberIntoIntDigitsArray(int number) { 
        ArrayList<Integer> digitList = new ArrayList<>();
        
        while (number > 0) {
            digitList.add(number % 10);
            number /= 10;
        }
        
        Collections.reverse(digitList);
        int[] digits = digitList.stream().mapToInt(i -> i).toArray();
       
        return digits;
    } 
    public static void main(String[] args) {
        int number = 12345;
        int[] digits = intNumberIntoIntDigitsArray(number);

        for (int digit : digits) {
            System.out.print(digit + " ");
        }
    }
}


   
   
/*
run:
   
1 2 3 4 5 
   
*/

 

70+ SQL courses for beginners and professionals