Postgresql如何将numrange更改为数字列类型

Question

public static void main(String[] arg) {

     Scanner s=new Scanner(System.in);
     System.out.println("Enter any integer: ");
     int sum=0;
     int x=s.nextInt();
     int y=recursion(x);
     System.out.println("The Sum of the digits is: "+ y);

 }   

public static int recursion(int y) {
  if(y/10>=1) {
      int tempvar =y%10;
      int remain=y/10;
      return tempvar + recursion(remain); 
  }
  else {            
      return y;
  }

}

我收到此错误：

  

查询失败：错误：无法将类型数字转换为数字

如何更改？