Is there any way to paint that circle gradient

Question

I am trying to make something similar to LED diode in Java ( I extend JPanel and override paint method ). I draw cicrle in center of panel with radius =20px ( green on, red off). Is there any way to paint that circle gradient ( darker in rcenter and lighte at edge ) ?

Answer 1

是：使用RadialGradientPaint绘制圆。