HDOJ 1042 N!(大数阶乘JAVA)

Problem Description
Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!

Input
One N in one line, process to the end of file.

Output
For each N, output N! in one line.

Sample Input
1
2
3

Sample Output
1
2
6

JAVA 大数轻松AC！

import java.math.BigDecimal;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        while(sc.hasNext()){
            BigDecimal n = sc.nextBigDecimal();
            BigDecimal m=new BigDecimal(1);
            for(int i=2;i<=n.intValue();i++){
                m = m.multiply(new BigDecimal(i));
            }
            System.out.println(m.toPlainString());
        }
    }

}