import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;//=================================================// File Name       :	Factorial_demo//------------------------------------------------------------------------------// Author          :	Common//类名：//属性：//方法：//主类//Function        : 	triangle_demopublic class Factorial_demo {	public static void main(String[] args) throws Exception{		// TODO 自动生成的方法存根		System.out.println("输入数字：");		int theNumber = getInt();		int theAnswer = factorial(theNumber); 		System.out.println("阶乘："+theAnswer);	}		public static int factorial(int n){		//递归		if(n == 1)			return 1;		else			return (n*factorial(n-1));	}		//输出方法		public static String getString() throws IOException{			InputStreamReader isr = new InputStreamReader(System.in);			BufferedReader br = new BufferedReader(isr);			String s = br.readLine();			return s;		}				//输出方法		public static int getInt() throws IOException{			String s = getString();			return Integer.parseInt(s);					}}