import javax.swing.*;
public class FrameBulldozer extends JFrame {
    private PictureBoxBulldozer pictureBoxBulldozer;
    public FrameBulldozer() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pictureBoxBulldozer = new PictureBoxBulldozer();
        add(pictureBoxBulldozer);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }
}