need help doing #5, what i have so far is from another program which im trying t

Question

need help doing #5, what i have so far is from another program which im trying to change using Arraylist

5. Add a static method to the class Pa6_your-id that receives an ArrayList-Double> and nothing else, then outputs the sum of the elements in the ArrayList Double> with an even index. Note that zero is not even. The method returns nothing. The sum output is to be limited to 2 decimal places 6. Add a static method to the class Pa6_your-id that receives an ArrayList and nothing else, thern outputs the number of negative values stored in the ArrayListDouble> elements. The method returns nothing.

Explanation / Answer

public static double sumEvenIndexElements(ArrayList<Double> arr)

{

    int i;

    double sum = 0.0;

   

    // start from first even index 2

    // increment i by 2 after each iteration

    for( i = 2 ; i < arr.size() ; i += 2 )

        sum += arr.get(i);

   

    // get sum upto 2 decimal places using format() function

    String temp = String.format("%.2f", sum);

   

    // convert String to double

    return Double.parseDouble( temp );

}

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