Java递归方法求5!的实现代码

import java.util.Scanner;public class Ex22 {public static void main(String[] args) {  Scanner s = new Scanner(System.in);  int n = s.nextInt();  Ex22 tfr = new Ex22();  System.out.println(tfr.recursion(n)); } public long recursion(int n) {  long value = 0 ;  if(n ==1 || n == 0) {  value = 1;  } else if(n > 1) {  value = n * recursion(n-1);  }  return value;} }

public class lianxi22 {public static void main(String[] args) {    int n = 5;  rec fr = new rec();  System.out.println(n+"! = "+fr.rec(n));}}class rec{public long rec(int n) {  long value = 0 ;  if(n ==1 ) {   value = 1;  } else  {   value = n * rec(n-1);  }  return value;}}