方法setText(String)没有为类型JPanel定义

private JPanel textField = new JPanel();

public class Moves extends JFrame implements Observer {
     public Moves(final CLASS1 class1){
        textField.setLayout(new BoxLayout(textField, BoxLayout.LINE_AXIS));
    textField.add(new JTextField("Moved: " + hm.getMoveCount()));
     }
    public void update(Observable o, Object arg){ 
        textField.setText("Update: " + hm.updateMoves());

    }
}
private JPanel textField = new JPanel();

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