Question

I have a class holding a boolean, and two doubles, and then an array of that class, I need the boolean and doubles to have defaults values of false, 0.0, and 0.0, and then I have function that refers to an element of the array and the moment I try to access an one of the variables from the class it throws an exception saying its null. Here is my class and my function calling it.

    public class PanelData {
        boolean flag = false;
        double tempStart = 0.0;
        double tempEnd = 0.0;
    }

    private PanelData[] panelInfo = new PanelData[115];

private void panelInfoHandler (int i, double timeStart, double timeEnd) throws SQLException
    {
        if (!panelInfo[i].flag) {
            delete();
            insert();
            panelInfo[i].flag = true;
            panelInfo[i].tempStart = timeStart;
            panelInfo[i].tempEnd = timeEnd;
        }
        else if (panelInfo[i].tempStart <= timeStart && panelInfo[i].tempEnd >= timeEnd) {

        }
        else
        {
            insert();
            panelInfo[i].tempStart = timeStart;
            panelInfo[i].tempEnd = timeEnd;
        }
    }

here is how I call the class.

panelInfoHandler(9, parsedStart, parsedEnd);

Answer 1

new PanelData[115] creates an array of 115 null references. Have you populated panelInfo with references to actual objects?

At a minimum, you then need to loop through that array and create new instances of PanelData for each element in the array, e.g.

for (int i = 0; i < panelInfo.length; i++)
  panelInfo[i] = new PanelData();