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Refactor 03_recursive sum (Java) to use int[] #322

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Refactor 03_recursive sum (Java) to use int[] #322

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16 changes: 6 additions & 10 deletions 03_recursion/java/04_sum/src/Sum.java
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Original file line number Diff line number Diff line change
@@ -1,19 +1,15 @@
import java.util.*;

public class Sum {
public static int sum(ArrayList<Integer> num_list, int index) {

if (num_list.size() == index) {
return 0;
} else {
int num = num_list.get(index);
return num + sum(num_list, index + 1);
public static int sum(int[] arr, int startIndex){
if (startIndex == arr.length) {
return 0; // Base case: end of array
}

return arr[startIndex] + sum(arr, startIndex + 1);
}

public static void main(String[] args) {
int total = sum(new ArrayList<Integer>(Arrays.asList(2, 4, 6)), 0);
System.out.println(total);
int[] numbers = new int[]{ 2, 4, 6};
System.out.println(sum(numbers, 0));
}
}