Language: JAVA 15

We can solve this problem in two ways:

1) By using For Each Loop to iterate all elements in List and adding it to the variable sum :

public static int simpleArraySum(List<Integer> ar) {
    
    int sum= 0;
    for( int i : ar ){
        sum = sum + i ;   // i contains elements of List ar
    }
		
    return sum;
    }

2) And by using For Loop where we will add each element present in List using ListName.get(index) method to variable sum :

public static int simpleArraySum(List<Integer> ar) {
    
    int sum= 0;
    for( int i=0; i < ar.size(); i++ ){
        sum = sum + ar.get(i) ;
    }
    
    return sum;
    }

how to find the test case1 and test case 2. Question is n't display.

return sum(ar)

Here is my c++ solution, you can watch the explanation here : https://youtu.be/b7KAvErmVIw

int simpleArraySum(vector<int> ar) {
    int sum = 0;
    for(int i = 0; i < ar.size(); i++){
        sum += ar[i];
    }
    return sum;
}

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