Java 例题3.11

*3.11(Find the number of days in a month) Write a program that prompts the user to enter the month and year and displays the number of days in the month. For example, if the user entered month 2 and year 2012, the program should display that February 2012 had 29 days. If the user entered month 3 and year 2015, the program should display that March 2015 had 31 days.

（查找一个月的天数）编写一个程序，提示用户输入月份和年份，并显示这个月的天数。例如，如果用户输入了2012年2月，程序应该显示2012年2月有29天。如果用户输入了3个月和2015年，程序应该显示2015年3月有31天。

代码如下：

import  java.util.Scanner;
public class test {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.println("请输入年份year");
		int year =  scan.nextInt();
		System.out.println("请输入月份month");
		int month =  scan.nextInt();
		int days=0;
		if(year % 4==0)
		{
			switch(month)
			{
			case 1:
				days=31;
				break;
			case 2:
				days=28;
				break;
			case 3:
				days=31;
				break;
			case 4:
				days=30;
				break;
			case 5:
				days=31;
				break;
			case 6:
				days=30;
				break;
			case 7:
			case 8:
				days=31;
				break;
			case 9:
				days=30;
				break;
			case 10:
				days=31;
				break;
			case 11:
				days=30;
				break;
			case 12:
				days=31;
				break;
			}
				System.out.println(year+"年"+month+"月有"+days+"天");
			
		}
		else
		{
			switch(month)
			{
			case 1:
				days=31;
				break;
			case 2:
				days=29;
				break;
			case 3:
				days=31;
				break;
			case 4:
				days=30;
				break;
			case 5:
				days=31;
				break;
			case 6:
				days=30;
				break;
			case 7:
			case 8:
				days=31;
				break;
			case 9:
				days=30;
				break;
			case 10:
				days=31;
				break;
			case 11:
				days=30;
				break;
			case 12:
				days=31;
				break;
			}
			System.out.println(year+"年"+month+"月有"+days+"天");
		}

	}

}
/*
 这个代码段十分冗余，鉴于小郭是初学，望大家见谅，我也会尽快改正使它更加简洁高效

*/

结果如下：