Java枚举

import java.util.*;
import java.math.*;

enum NUM{
  负数即小于0,大于0
}

public class Main{

  public static void main(String[] args) {
    Scanner cin = new Scanner(System.in);

    int a = cin.nextInt();
    if(a<0) {
      System.out.println(NUM.负数即小于0);
    }
    else {
      System.out.println(NUM.大于0);
    }
  }
}