Using Point, Line and Box objects

PDF pdf = new PDF();

Page page = new Page(pdf, Letter.PORTRAIT);

Box flag = new Box();
flag.setPosition(100.0, 100.0);
flag.setSize(190.0, 100.0);
flag.setColor(RGB.LIGHT_GRAY);
flag.setLineWidth(0.0);
flag.drawOn(page);

double sw = 7.69;   // stripe width
Line stripe = new Line(0.0, sw/2, 190.0, sw/2);
stripe.setWidth(sw);
stripe.setColor(RGB.OLD_GLORY_RED);
for (int row = 0; row < 7; row++) {
    stripe.placeIn(flag, 0.0, row * 2 * sw);
    stripe.drawOn(page);
}

Box union = new Box();
union.setSize(76.0, 53.85);
union.setColor(RGB.OLD_GLORY_BLUE);
union.setFillShape(true);
union.placeIn(flag, 0.0, 0.0);
union.drawOn(page);

double h_si = 12.6; // horizontal star interval
double v_si = 10.8; // vertical star interval
Point star = new Point(h_si/2, v_si/2);
star.setShape(Point.STAR);
star.setRadius(3.0);
star.setColor(RGB.WHITE);
star.setFillShape(true);

for (int row = 0; row < 6; row++) {
    for (int col = 0; col < 5; col++) {
        star.placeIn(union, row * h_si, col * v_si);
        star.drawOn(page);
    }
}
star.setPosition(h_si, v_si);
for (int row = 0; row < 5; row++) {
    for (int col = 0; col < 4; col++) {
        star.placeIn(union, row * h_si, col * v_si);
        star.drawOn(page);
    }
}

pdf.wrap();
pdf.save("Example_01.pdf");