Не видит метод addContentPane

package com.company;

import javax.swing.; import java.awt.;

public class Main {

public static void main(String[] args) {
    Frame frame = new Frame("The Game");


    JPanel panel = new JPanel();

    JLabel qustLabel = new JLabel("Question: ");
    JLabel ansLabel = new JLabel("Answer: ");

    JTextArea question = new JTextArea();
    JTextArea answer = new JTextArea();

    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
    
    frame.getContentPane().add(BorderLayout.NORTH, panel);
    
    frame.setSize(400, 600);
    frame.setVisible(true);
}

}