PIbd-21_Kryukov_A_I_Excavator_HARD/src/FrameDop.java

import javax.swing.*;

public class FrameDop extends JFrame {

    private PictureBoxDop pictureBoxDop;

    public FrameDop() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pictureBoxDop = new PictureBoxDop();
        add(pictureBoxDop);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }
}