java随机生成十六进制颜色
r : r ; 10 g = g.length()==1 ? "0" + g : g ; 11 b = b.length()==1 ? "0" + b : b ; 12 13 System.out.println( r+g+b);; 14 15 }

3A9890

http://wandejun1012.iteye.com/blog/1179801