How to set dash line color(two colors)?

hello all:
Does anyone know how to set dash line color in java?
I only know how to set line color with a single color.
g2.setColor(Color.black);
g2.setStroke(dashed);
g2.draw(new Rectangle2D.Double(50, 50, 200,100));
what I need to implement is two colors interleave on the dash line.
so that dash line looks like this:
==== ====
red white red white
thank you for any comments.
-Daniel.

create 2 strokes, space them appropriately, draw the rectangle twice.

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