Applet画面中绘制一个19×19的围棋棋盘 在Applet画面中绘制一个19×19的围棋棋盘。棋盘的颜色由白（white）、灰(gray)、橘黄(orange)、浅红(pink)几种颜色中随机选取。-Applet picture drawing a 19 x 19 Go Applet chessboard in drawing a picture 000 19 x 19 Go chessboard. Calculations by the color white (white), gr