Sum arrays with recursion

Make a note of zj Batch algorithm in advance ：

Sum arrays with recursion ：
The algorithm will be written immediately , But when running, it always reports stack overflow , I thought there was something wrong with my recursive logic , Has been changing ,
But it's still wrong , It finally got stuck … … The start is GG, I also panicked a lot , As a result, I didn't work out the second problem .
The initial code is as follows ：

/** * @author guochao * @date 2022/7/22 */
public class Main {
    
    public static void main(String[] args) {
    
        int[] nums ={
    1,2,3};
        System.out.println("sum="+getSum(nums, 0));
    }
    public static int getSum(int[] nums, int i){
    
        if(i >= nums.length) return 0;
        int sum  = getSum(nums, i++);
        int result = nums[i] + sum;
        return result;
    }
}

result ：

Because the interview is a whiteboard , unable debug, After the interview , I'm on my own idea Inside debug, Finally, I found the problem ！！！
The problem is i++、i+1、++i.

My code says i++, But the correct way to write it is i+1.
After this lesson , I have a deeper understanding of the self increasing three Chinese Writing , I believe I won't be wrong again .

i+1： Do not change the original i Value , Unless mandatory assignment , such as ：i = i + 1;
i++ and ++i Will change i Value , But the order of self increment is different ,i++ It is first used in autoincrement ,++i It is self increasing before using .
How is the use defined here ？ I think it can be divided into two points intuitively ：
1、 Direct assignment
eg：a = i++;
2、 The formal parameter assignment of the calling function
eg：function(++i);

May have a look , Here are three examples ：

/** * @author guochao * @date 2022/7/22 */
public class test {
    
    public static void main(String[] args) {
    
        for(int i=0; i<5; i++){
    
            aa(i++);                     //  Notice the changes in this line ！
        }
    }

    public static void aa(int i){
    
        System.out.print(i + " ");
    }
}

/** * @author guochao * @date 2022/7/22 */
public class test {
    
    public static void main(String[] args) {
    
        for(int i=0; i<5; i++){
    
            aa(++i);                     //  Notice the changes in this line ！
        }
    }

    public static void aa(int i){
    
        System.out.print(i + " ");
    }
}

/** * @author guochao * @date 2022/7/22 */
public class test {
    
    public static void main(String[] args) {
    
        for(int i=0; i<5; i++){
    
            aa(i+1);                     //  Notice the changes in this line ！
        }
    }

    public static void aa(int i){
    
        System.out.print(i + " ");
    }
}