public class NotePaint  extends JComponent {
    private int x=65,y=40;
    
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D)g;
        g2d.setColor(Color.black);
     
        g2d.drawOval(x, y, 20, 10);

    }
}

public class NPC extends JComponent{
Image image = new ImageIcon("images/npc.png").getImage();

    private int xi;
    private int yi; 

public NPC(){
    setBorder(BorderFactory.createLineBorder(Color.yellow));
    //setLayout(null);
   // setSize(500, 500);
}

    public int getXi() {
        return xi;
    }


    public void setXi(int x) {
        this.xi = x;
    }


    public int getYi() {
        return yi;
    }

    public void setYi(int y) {
        this.yi = y;
    }
   
        public void paintComponent (Graphics g) {
            super.paintComponent(g);
            //g.drawOval(getXi(), getYi(), 20, 20);
            //  g.drawImage(image, 0, 0, null);
            g.drawImage(image, getXi(), getYi(), this);
 
        
    }
    
}

import java.awt.BorderLayout;
import javax.swing.JFrame;

public class NewClass {
private int x = 3;
private int y = 20;

    public static void main (String[] args) {
        
        NewClass main = new NewClass();
        main.go();
    }
 
    public void go () {
        JFrame frame = new JFrame();
        ImagePanel background = new ImagePanel("images/Bnote_stan.jpg"); 
        NPC panel = new NPC();
        NotePaint BNote = new NotePaint();
        
        frame.getContentPane().add(background);
        background.setLayout(new BorderLayout());
        background.add(panel);
        //Если раскомментировать эту строку, npc пропадает
        //background.add(BNote);

 
        frame.setSize(500, 500);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
         Runnable r = new NPCRunnable(panel);
         Thread t = new Thread(r);
         t.start();  
    

}
        
    
class NPCRunnable implements Runnable
{
  
   private NPC img;
   public static final int STEPS = 500;
   public static final int DELAY = 500;
 
   
   public NPCRunnable( NPC img)
   {
      this.img=img;
   }

   public void run()
   {
      try
      {
         for (int i = 1; i <= STEPS; i++)
         {
            x=x+5;
            img.setXi(x);
            img.setYi(y);
            img.repaint();
            Thread.sleep(DELAY);
         }
      }
      catch (InterruptedException e)
      {
      }
   }
}
}