Java在图形对象上设置透明度而不是颜色对象

Question

Is there any way to set the transparency of a Graphics or Graphics2D object in Java as opposed to a Color object?

Something like this is what I want:

graphics.setAlpha(0.5);
graphics.setColor(Color.BLACK);
graphics.fillRect(0, 0, 100, 100);
graphics.setAlpha(1);

Any insight? This is a simplified version of what I'm doing, please don't reply with workarounds, I would just like to know if this is possible.

Answer 1

So after a few irrelevant answers and some more digging I found the solution. The AlphaComposite class.

used like this:

Composite originalComposite = graphics.getComposite();
AlphaComposite alphaComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);
graphics.setComposite(alphaComposite);
graphics.setColor(Color.BLACK);
graphics.fillRect(0, 0, 100, 100);
graphics.setComposite(originalComposite);