单选题 有如下程序: public class Main { public static void main(String[] args) { Scanner sca = new Scanner(System.in); int x = sca.nextInt(); if(x>3){ System.out.println("231"); }else if(x>-3){ System.out.println("123"); }else{ System.out.println("321"); } } } 当打印"321",x的取值范围是()