Passing as vararg need "," so sending sepratly each.

public class Solution { void adds(int ...a){ int sum=0; for(int i=0;i } } System.out.println("="+sum);

}

 public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);  
   Solution s =new Solution(); 
    ArrayList<Integer> li = new ArrayList<>();
    for(int i = 0 ; i<6 ; i++){
       li.add(sc.nextInt());
    }
    int[] arr = li.stream().mapToInt(Integer::intValue).toArray();

    s.adds(arr[0], arr[1]);
    s.adds(arr[0], arr[1], arr[2]);
    s.adds(arr[0], arr[1], arr[2], arr[3], arr[4]);
    s.adds(arr[0], arr[1], arr[2], arr[3], arr[4], arr[5]);
 }

}