public void readData(){
    // Initialise the array (size should be at least 2000)
    int[] data = new int[2000];
    File file = new File(FileChooser.open("Choose file to be read"));
    // read the data from the file into the array
    try {
        count = 0;
        Scanner scan = new Scanner(file);
        while (scan.hasNextInt()){
            int currentNum = scan.nextInt();
            this.data[count++] = currentNum;
        }
    }

    catch(IOException e){
    JOptionPane.showMessageDialog(this.frame, "File loading failed: "+e);
    }

  }