class FirstFrame extends Frame {
    private ImageIcon icon;

    public FirstFrame() {
        icon = new ImageIcon("image.png");

        Button b = new Button("Test");
        b.setBounds(30, 100, 80, 30);
        this.add(b);
        setSize(300, 300);

        setLayout(null);
        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        g.drawImage(icon.getImage(), 0, 0, this);
    }
}