Question

I have a method that takes in a string array and finds the averages of every few items depending on the length. I would like the method to delete the first few items in the array depending on the value of offset.

public static double[] getMovingAverage(String[] priceList, int length, int offset){

    double[] newPriceList = convert(priceList);

    int listLength = newPriceList.length;
    int counter = 0;
    double listsum;
    double[] movingAverage = new double[listLength];

    try{
        for (int aa = 0; aa < listLength-1; aa++){
            listsum = 0;
            for (int bb = 0; bb < length; bb++){
                counter = aa+bb;

                listsum = listsum + newPriceList[counter];
            }
            movingAverage[aa] = listsum / length;
        }
        if (offset>0){

                        //remove first #offset# elements

        }
    }catch(Exception e){
        System.out.println(e);
    }
    return movingAverage;
}

*note: convert(); converts String[] to double[]

Answer 1

Arrays are fixed-length in Java. (You can’t change the length of an array.)

You can however create a new array with the first offset elements removed quite easily:

double[] movingAverage = { 0.1, 0.2, 1.1, 1.2 };
int offset = 2;

// print before
System.out.println(Arrays.toString(movingAverage));

// remove first offset elements
movingAverage = Arrays.copyOfRange(movingAverage, offset, movingAverage.length);

// print after
System.out.println(Arrays.toString(movingAverage));

Output:

[0.1, 0.2, 1.1, 1.2]
[1.1, 1.2]