怎样用Java编写“求9以内奇数的阶乘的和”的代码

public class JieChenghe{
public static void man(String args[]){
double sum=0;
for(int i=1;i<=9;i=i+2){
sum=sum+jiecheng(i);
System.out.println("1-9的奇数阶乘和为："+sum);
}
}
public static long jiecheng(int i){
if(i==1){
return 1;

}else{
return i*jiecheng(i-1);

}
}