使用switch case语句来显示月份的对应天数

旧城等待， 2024-02-17 17:47 62阅读 0赞

方法一：控制台输入月份

package com.liaojianya.chapter1;
    
    import java.util.Scanner;
    
    /**
     * This program demonstrates thw way of implements 
     * display the number of days according to 12 months.
     * @author Hugh
     * 2016年7月19日
     */
    public class MonthAndDays
    {
    	public static void main(String[] args)
    	{
    		System.out.println("please enter a number : 1~12");
    		@SuppressWarnings("resource")
    		Scanner scan = new Scanner(System.in);
    		int month = scan.nextInt();
    		switch (month)
    		{
    		case 1:
    			System.out.println("January has 31 days");
    			break;
    		case 2:
    			System.out.println("February has 28 days");
    			break;
    		case 3:
    			System.out.println("March has 31 days");
    			break;
    		case 4:
    			System.out.println("April has 30 days");
    			break;
    		case 5:
    			System.out.println("May has 31 days");
    			break;
    		case 6:
    			System.out.println("June has 30 days");
    			break;
    		case 7:
    			System.out.println("July has 31 days");
    			break;
    		case 8:
    			System.out.println("August has 31 days");
    			break;
    		case 9:
    			System.out.println("September has 30 days");
    			break;
    		case 10:
    			System.out.println("Octor has 31 days");
    			break;
    		case 11:
    			System.out.println("November has 30 days");
    			break;
    		case 12:
    			System.out.println("December has 31 days");
    			break;
    			default: 
    				System.out.println("Error month information");
    		}
    	}
    
    }

运行结果：

please enter a number : 1~12
    4
    April has 30 days

方法二：随机产生1-12之间的某个整数：

package com.liaojianya.chapter1;
    /**
     * This program demonstrates thw way of implements 
     * display the number of days according to 12 months.
     * @author Hugh
     * 2016年7月19日
     */
    public class MonthAndDays
    {
    	public static void main(String[] args)
    	{
    		int month = (int)(Math.random() * 12);
    		System.out.println("随机产生一个月份并显示月份: " + month);
    		switch (month)
    		{
    		case 1:
    			System.out.println("January has 31 days");
    			break;
    		case 2:
    			System.out.println("February has 28 days");
    			break;
    		case 3:
    			System.out.println("March has 31 days");
    			break;
    		case 4:
    			System.out.println("April has 30 days");
    			break;
    		case 5:
    			System.out.println("May has 31 days");
    			break;
    		case 6:
    			System.out.println("June has 30 days");
    			break;
    		case 7:
    			System.out.println("July has 31 days");
    			break;
    		case 8:
    			System.out.println("August has 31 days");
    			break;
    		case 9:
    			System.out.println("September has 30 days");
    			break;
    		case 10:
    			System.out.println("Octor has 31 days");
    			break;
    		case 11:
    			System.out.println("November has 30 days");
    			break;
    		case 12:
    			System.out.println("December has 31 days");
    			break;
    //			default: 
    //				System.out.println("Error month information");
    		}
    	}
    
    }

运行结果：

随机产生一个月份并显示月份: 3
    March has 31 days

分析：随机产生月份时，default可以省略。

显示12个月各自全部的天数：

package com.liaojianya.chapter1;
    /**
     * This program demonstrates the way of using array to storage days of each month.
     * @author Hugh
     * 2016年7月19日
     */
    public class ArrayDemo
    {
    	public static void main(String[] args)
    	{
    		int[] month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    		for(int i = 0; i < month.length; i++)
    		{
    			System.out.println("第" + (i+1) + "月有" + month[i] + "天!");			
    		}
    	}
    
    }

运行结果：

第1月有31天!
    第2月有28天!
    第3月有31天!
    第4月有30天!
    第5月有31天!
    第6月有30天!
    第7月有31天!
    第8月有31天!
    第9月有30天!
    第10月有31天!
    第11月有30天!
    第12月有31天!