淺談Java開發中如何定義的全域變數

import java.util.*;
public class Main{    
      static int ans;//定义全局变量
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);        
        int n;        
        while(scan.hasNext()){
            ans = 0;
            n = scan.nextInt();
            System.out.println(fib(n)+"\n递归调用了"+ans+"次");
        }
    }    
    private static int fib(int n){
        ans ++;        
        if(n == 1 || n == 2) return 1;        
        return fib(n-1)+fib(n-2);
    }
}