使用applet產生五個同心圓，圓與圓間距相同且每個圓使用不同的顏色，執行時經由參數輸入圓心x,y的座標值、最小圓的半徑及間距。-Applet generated using five concentric circles, round and round the same pitch circle and each using a different color, the implementation of input parameters through the center of a circle x, y coordinates of the value of the radius of the smallest and the pitch circle.