Ergänze die fehlenden Schlüsselwörter:

public class 
Main {
    
    public Main(Window window) {
        window.setLabelText("Hello World");
    }
    public static void main(String[] args) {
        (.classargs);
    }
}

public class Window extends JFrame {
    private JLabel label;
    
    public Window() {
        this.setTitle("Zähler");
        this.setSize(240, 80);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.label = new JLabel("");
        this.add(this.label);
        this.setVisible(true);
    }
    
    public void setLabelText(String text) {
        this.label.setText(text);
    }
}