Thread: Help on an assignment

Hello Everyone,

I am working on a project for a class where we just need to make a very generic PAPI . I almost have it done, but I am having trouble fulfilling the last requirement. We need to have a method "+ PAPICompontent(runway : int)" runway is an int variable. The part I am not understanding is it says to "Create a constructor that takes the runway number and assigns it to the runway instance variable. The code that I have is:

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JComponent;
import java.awt.Color;
import java.awt.geom.Ellipse2D;
import java.awt.Font;
 
public class PAPIComponent extends JComponent
{
 
   private int runway;
   private Color light1;
   private Color light2;
   private Color light3;
   private Color light4;
 
   public PAPIComponent(int runway)
   {
      light1 = Color.WHITE;
      light2 = Color.WHITE;
      light3 = Color.RED;
      light4 = Color.RED; 
   }
 
   public void paintComponent(Graphics g)
   {
      Graphics2D g2 = (Graphics2D) g;
      String rw = String.valueOf(runway);
 
      g2.setColor(Color.WHITE);
      g2.setFont(new Font("TimesRoman", Font.PLAIN, 72)); 
      g2.drawString(rw, 70, 300);
 
      g2.setColor(Color.BLACK);
      Rectangle background = new Rectangle(0, 0, 400, 650);
      g2.fill(background);
 
      g2.setColor(Color.WHITE);
      Rectangle median = new Rectangle(190, 0, 8, 100);
      g2.fill(median);
      median.translate(0,150);
      g2.fill(median);
      median.translate(0,150);
      g2.fill(median);
      median.translate(0,150);
      g2.fill(median);
 
      Rectangle threshold = new Rectangle(20, 550, 35, 80);
      g2.fill(threshold);
      threshold.translate(40, 0);
      g2.fill(threshold);
      threshold.translate(40, 0);
      g2.fill(threshold);
      threshold.translate(40, 0);
      g2.fill(threshold);
      threshold.translate(72, 0);
      g2.fill(threshold);
      threshold.translate(40, 0);
      g2.fill(threshold);
      threshold.translate(40, 0);
      g2.fill(threshold);
      threshold.translate(40, 0);
      g2.fill(threshold);
 
      Rectangle bottom = new Rectangle(0, 650, 400, 150);
      g2.fill(bottom);
 
      Ellipse2D.Double circle1 = new Ellipse2D.Double(50, 665, 50, 50);
      g2.setColor(light1);
      g2.fill(circle1);
      g2.setColor(Color.BLACK);
      g2.draw(circle1);
 
 
      Ellipse2D.Double circle2 = new Ellipse2D.Double(125, 665, 50, 50);
      g2.setColor(light2);
      g2.fill(circle2);
      g2.setColor(Color.BLACK);
      g2.draw(circle2);
 
      Ellipse2D.Double circle3 = new Ellipse2D.Double(200, 665, 50, 50);
      g2.setColor(light3);
      g2.fill(circle3);
      g2.setColor(Color.BLACK);
      g2.draw(circle3);
 
 
      Ellipse2D.Double circle4 = new Ellipse2D.Double(275, 665, 50, 50);
      g2.setColor(light4);
      g2.fill(circle4);
      g2.setColor(Color.BLACK);
      g2.draw(circle4);
   }
 
   public void glidePathOn()
   {
      light1 = Color.WHITE;
      light2 = Color.WHITE;
      light3 = Color.RED;
      light4 = Color.RED;
   }
 
   public void glidePathSlightlyHigh()
   {
      light1 = Color.WHITE;
      light2 = Color.WHITE;
      light3 = Color.WHITE;
      light4 = Color.RED;
   }
 
   public void glidePathTooHigh()
   {
      light1 = Color.WHITE;
      light2 = Color.WHITE;
      light3 = Color.WHITE;
      light4 = Color.WHITE;
   }
 
   public void glidePathSlightlyLow()
   {
      light1 = Color.WHITE;
      light2 = Color.RED;
      light3 = Color.RED;
      light4 = Color.RED; 
   }
 
   public void glidePathTooLow()
   {
      light1 = Color.RED;
      light2 = Color.RED;
      light3 = Color.RED;
      light4 = Color.RED;  
   }
}

And the viewer:

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.awt.Color;
public class PAPIViewer
{
   public static void main(String[] args)
   {
      JFrame frame = new JFrame();
      frame.setSize(400, 800);
      frame.setTitle("PAPI");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
      PAPIComponent component = new PAPIComponent();
      frame.add(component);      
 
      component.glidePathOn();      
      frame.setVisible(true);
      JOptionPane.showMessageDialog(frame, "On glide path");
 
      component.glidePathSlightlyHigh();      
      frame.repaint();
      JOptionPane.showMessageDialog(frame,  "Glide path slightly high.");
 
      component.glidePathTooHigh();      
      frame.repaint();
      JOptionPane.showMessageDialog(frame,  "Glide path too high.");
 
      component.glidePathSlightlyLow();      
      frame.repaint();
      JOptionPane.showMessageDialog(frame,  "Glide path slightly low.");
 
      component.glidePathTooLow();      
      frame.repaint();
      JOptionPane.showMessageDialog(frame,  "Glide path too low.");
 
 
   }
}

I am also having an issue with the viewer. After I added the (int runway) to PAPIComponent I can't get the viewer to compile anymore. Also I cannot get the runway variable to actually draw and appear.

If you need any more info let me know. Any help is very much appreciated!

I am not sure what i need to add to " new PAPIComponent(); ". From reading the error I am getting that I need to add an argument to it so they have the same amount, but I don't know what that argument should be.

UPDATE:
I got it compiling and running again with "new PAPIComponent(32); " would this be correct?