这是一道java编程题：定义一个计算n!的类Fact，然后在主类中创建一个对象，求5！的值

public class Test {

private int n;

private int sum=1;

public Test(int n) {
this.n = n;
}

public int jisuan() {
for (int i = 1; i <= n; i++) {
sum *= i;
}
return sum;
}

public static void main(String args[]) {
Test test = new Test(5);
System.out.println(test.jisuan());
}

}

public class Fact{

public int getResult(int x){
int sum = 1;
for(int i=1; i<=x; i++)
{
sum *= i;
}
return sum;
}
public static void main(String[] argc){
Fact f = new Fact();
f.getResult(5);

}

}