Java 实例 用于检查数字是正还是负

public class Demo
{
    public static void main(String[] args) 
    {
        int number=109;
        if(number > 0)
        {
            System.out.println(number+" is a positive number");
        }
        else if(number < 0)
        {
            System.out.println(number+" is a negative number");
        }
        else
        {
            System.out.println(number+" is neither positive nor negative");
        }
    }
}

109 is a positive number

import java.util.Scanner;
public class Demo
{
    public static void main(String[] args) 
    {
        int number;
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter the number you want to check:");
        number = scan.nextInt();
        scan.close();
        if(number > 0)
        {
            System.out.println(number+" is positive number");
        }
        else if(number < 0)
        {
            System.out.println(number+" is negative number");
        }
        else
        {
            System.out.println(number+" is neither positive nor negative");
        }
    }
}

Enter the number you want to check:-12
-12 is negative number