Latest posts of: Neil Q - Java-Gaming.org

I'm trying to get a simple rectangle moving around on my JPanel.

everything is set up except for the fact the rectangle doesn't respond to the keys.

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package game;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.*;

@SuppressWarnings("serial")
public class Main extends JPanel implements KeyListener, ActionListener {
   
   private final int frameHeight = 400;
   private final int frameWidth = 400;
   private int objectDimension = 15;
   
   JMenuBar menuBar;
   JMenu file;
   JMenuItem newGame;
   JMenuItem checkScore;
   JMenuItem endGame;
   
   int objectX = 150;
   int objectY = 150;
   
   int velX = 0; // speed object moves X axis
   int velY = 0; // speed object moves Y axis
   
   // CONSTRUCTOR
   public Main() {
      
      //JMenuBar
      menuBar = new JMenuBar();
      file = new JMenu("File");
      newGame = new JMenuItem("New Game");
      checkScore = new JMenuItem("Check Score");
      endGame = new JMenuItem("End Game");
      
      menuBar.add(file);
      file.add(newGame);
      file.add(checkScore);
      file.addSeparator();
      file.add(endGame);
      
      
      addKeyListener(this);
      setFocusable(true);
      setFocusTraversalKeysEnabled(false);
   }
      
   public JMenuBar setJMenuBar(){
      return menuBar;
   }
   
   // SETS SIZE FOR FRAME
      @Override
      public Dimension getPreferredSize() {
         return new Dimension(frameWidth, frameHeight);
      }
   
   //PAINTCOMPONENT   
   public void paintComponent(Graphics g) {
      super.paintComponent(g);
      g.fillRect(objectX, objectY, objectDimension, objectDimension);
      
      
   }
   
   public void actionPerformed(ActionEvent e){
      objectX = objectX + velX;
      objectY = objectY + velY;
      
      repaint();
   }
   
   public void keyPressed(KeyEvent e){
      int key = e.getKeyCode();
      
      if(key == KeyEvent.VK_LEFT){
         velX = -1;
         velY = 0;
      }
      if(key == KeyEvent.VK_UP){
         velY = -1;
         velX = 0;
      }
      if(key == KeyEvent.VK_RIGHT){
         velX = +1;
         velY = 0;
      }
      if(key == KeyEvent.VK_DOWN){
         velY = +1;
         velX = 0;
      }
   }
   
   public void keyReleased(KeyEvent e){}
   public void keyTyped(KeyEvent e){}
         
   
   
   public static void createAndShowGui() {
      Main main = new Main();
      
      JFrame frame = new JFrame("My New Game!");
      frame.getContentPane().add(main);
      frame.setJMenuBar(main.setJMenuBar());
      frame.pack();
      frame.setVisible(true);
      
   }
   
   // MAIN METHOD
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable(){
         public void run(){
            createAndShowGui();
         }
      });   
   }
   
}

any suggestions of where I'm going wrong?