Question

I’m feeling lost as to how to do this. I am trying to perform a calculation with a value that needs to be a global variable. but to be global it has to be static. I need the for loop to be static too so it can perform the calculation in the array but I can’t remember how to do this.
The very last line of code is where I am stuck currently due to “Cannot find symbol” errors. I am trying to find a way to bring yVal0 in to this method so I can perform the calculation

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class RegressionGUI  extends JFrame
    implements ActionListener {
private JLabel VariableLabel = new JLabel("Select one independent Variable");

Answer 1

Again, I doubt that you need to use static anything, and a quick review of your (poorly formatted) code suggests that this is still so. Why not instead make some of your numeric variables class fields and not method-local or constructor-local so you can use them in any non-static method of the class?

e.g.,

public class RegressionGUI extends JFrame implements ActionListener {
   private JLabel VariableLabel = new JLabel("Select one independent Variable");
   private JButton X1btn = new JButton("Number of Bathrooms (X1)");
   private JButton X2btn = new JButton("Area of the site (X2)");
   private JButton X3btn = new JButton("Size of living space (X3)");
   private JButton X4btn = new JButton("Number of Garages (X4)");
   private JButton X5btn = new JButton("Number of Rooms (X5)");
   private JButton X6btn = new JButton("Number of bedrooms (X6)");
   private JButton X7btn = new JButton("Age (X7)");
   private JTextArea textArea = new JTextArea();
   private JScrollPane scrollPane = new JScrollPane(textArea);

   // **** added these guys
   private double[] xValues = new double[4];
   private double[] yValues = new double[4];