🚀 Programming Example
Split Integer Into Digits using Java
This program shows the use of either Arrays or ArrayLists for accomplishing this:
import java.util.*;
public class SplitDigits {
public static void main(String[] args) {
// Testing splitDigitsArrayList
System.out.println(Arrays.toString(splitDigitsArray(123)));
System.out.println(Arrays.toString(splitDigitsArray(40320)));
System.out.println(Arrays.toString(splitDigitsArray(-5914133)));
System.out.println(Arrays.toString(splitDigitsArray(0)));
// Testing splitDigitsArray
System.out.println(splitDigitsArrayList(123));
System.out.println(splitDigitsArrayList(40320));
System.out.println(splitDigitsArrayList(-5914133));
System.out.println(splitDigitsArrayList(0));
}
// int --> ArrayList<Integer>
public static ArrayList<Integer> splitDigitsArrayList(int number) {
ArrayList<Integer> digits = new ArrayList<Integer>();
do {
digits.add(0, number % 10);
number /= 10;
} while (number != 0);
return digits;
}
// int --> int[]
public static int[] splitDigitsArray(int number) {
int[] digits = new int[(""+Math.abs(number)).length()];
for (int i = digits.length-1; i >= 0; i--) {
digits[i] = number % 10;
number /= 10;
}
return digits;
}
}
[1, 2, 3]
[4, 0, 3, 2, 0]
[-5, -9, -1, -4, -1, -3, -3]
[0]
[1, 2, 3]
[4, 0, 3, 2, 0]
[-5, -9, -1, -4, -1, -3, -3][0]
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.