public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请录入一个整数: ");
        int num = sc.nextInt();
        if (num % 2 == 0) {
            System.out.println(num + "是偶数");
        } else {
            System.out.println(num + "是奇数");
        }
    }
}

```import java.util.Scanner;

public class IfDemo04 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请录入一个1 - 7之间的整数: ");
        int week = sc.nextInt();
        if (week == 1) {
        } else if(week == 2) {
            System.out.println("星期二");
        } else if(week == 3) {
            System.out.println("星期三");
        } else if(week == 4) {
            System.out.println("星期四");
        } else if(week == 5) {
            System.out.println("星期五");
        } else if(week == 6) {
            System.out.println("星期六");
        } else if(week == 7) {
            System.out.println("星期日");
        } else {
            System.out.println("没有这样的日期, 你是从火星来的吧!");
        }
    }
}