从键盘输入月份，判断月份天数import java.util.Scanner;public class Month{ public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc = new Scanner(System.in); System.out.println("请输入月份:"); int days; int month = sc.nextInt(); if (month == 2){ days =28; } else if (month == 4 ) { days = 30; } else if (month == 6 ) { days = 30; } else if (month == 9 ) { days = 30; } else if (month == 11 ) { days = 30; } else { days = 31; } System.out.println(month + "月有" +days+ "天"); } }