Доступ к переменным класса

package javaapplication1;
 
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Component;
import java.awt.Image;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
 
public class Gui extends JFrame {
    private static JLabel karta1;
    private static JLabel karta2;
 
    public void setKarta1(JLabel karta1) {
        this.karta1 = karta1;
    }
 
 
    public void setKarta2(JLabel karta2) {
        this.karta2 = karta2;
    }
    
    public Gui(int width,int heigth){
    super("okoshko");
    pack();
    setSize(width,heigth);
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
   // frame.add(karta1); // nullPointerException
     if (karta1 == null) System.out.println("false");
     else System.out.println("true");
 //  frame.add(karta2); // nullPointerException
    }
    
    
    public void otrisovka(Player player) {
    Card onecard = player.getOneCard();
    Card twocard = player.getTwoCard();
    Image image = null;
    Image image2 = null;
    
    try {
    File file = new File("src/cards/"+onecard.toString()+".gif");
    image = ImageIO.read(file);
    } catch (IOException e){}
    try {
    File file = new File("src/cards/"+twocard.toString()+".gif");
    image2 = ImageIO.read(file);
    } catch (IOException e){}
 
    JLabel testkarta1 = new JLabel(new ImageIcon(image));
    setKarta1(testkarta1);
    JLabel testkarta2 = new JLabel(new ImageIcon(image2));
    setKarta2(testkarta2);
 
    }
}
 
 
public class JavaApplication1 {
 public static void main(String[] args) {
    
        Pack koloda = new Pack();
        koloda.getTotalCards();
        koloda.printAllCards();
        
        Player first = new Player();
        first.addCard(koloda.pushCard());
        first.addCard(koloda.pushCard());
        
        Card firstCard = first.pocketCard.get(0);
        Card secondCard = first.pocketCard.get(1);
       
        Gui gui = new Gui(640, 480);
        gui.otrisovka(first);     
    }
}