I am getting error of misplaced constructs & variableDeclarator expected in below code while calling the method “twosum” from main method. What am I missing here while calling?

public class Sumofint {

public int[] twoSum(int[] nums, int target) {
    int total =0; 
    int output[] = null;
    for(int i = 0; i<=nums.length-1; i++){
        total = nums[i] +nums[i+1];
        if (total == target){
        output[0]= i;
        output[1]=i+1;
        }
    }
    return output;
}
public static void main(String []args) {
    
    Sumofint obj = new Sumofint();
    int arr[] = obj.twoSum({2,7,11,15},9);
    System.out.println(arr[0]+", " + arr[1]);
}

}

I was expecting a normal call happening to the twoSum method