Scanner ：提供input功能

import java.util.Scanner;

public class Demo2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个非0的数字：");
        int num = input.nextInt();

        String result=(num%2==0)?"偶数":"奇数";
        System.out.println(num+ "是" + result);
    }
}