Java数阶乘求和sum=1!+2!+...+10!

public static void main(String[] args)
{

int sum = 0;
for (int i = 1; i <= 10; i++)
{
int mul = 1;
for (int j = i; j >= 1; j--)
{
mul *= j;
}
sum += mul;
}
System.out.println(sum);
}

public int fact(int num){
if(num ==1){
return num;
}else if(num == 2){
num = 2*1;
}else{
num = num * fact(num-1);
}
return num;
}
public int getSum(int max){
int sum = 0;
for(int i=1; i<=max; i++){
sum += fact(i);
}
return sum;
}

fact(int num)//求num!
getSum(int max)//求1到max的!和

public static void main(String[] args) {
int sum1 = 1, sum2 = 0;
System.out.print("结果为：");
for (int i = 1; i <= 10; i++) {
sum1 = sum1 * i;
sum2 = sum2 + sum1;
}
System.out.print(sum2);
}

你问什么呢？