date.java

在里面有比较详细的注释 打开后运行后就能看到 这是我们以前的设计

import java.io.*;
public class Date {
 public static void main(String[] args) throws IOException
	{
		int year,month,day;
		boolean IsLeapYear;
		System.out.println("Input year:");
		BufferedReader in =new BufferedReader(
		                   new InputStreamReader(System.in));
		year=(new Integer(in.readLine())).intValue();
		System.out.println("Input the month:");
		BufferedReader inm=new BufferedReader(
		                   new InputStreamReader(System.in));
		month=(new Integer(in.readLine())).intValue();
		if(month<1||month>12)
		{
			System.out.println("wrong month");
		}
		else
		{
			if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
			    day=31;
                                                    else if(month==2)
	        {
	    	    IsLeapYear=((year%4==0 && year%100 !=0)||(year%400 == 0));
                        //判断该年是否为闰年
		        if (IsLeapYear) 
		    	   day=29;
		        else
		    	   day=28;
	        }
		    else day=30;
		    String m[]={"January","February","March","April","May","July","August","September","October"
	    		,"November","October","November","Decemeber"};
		    System.out.println(m[month-1]+"，"+year+" has "+day+" days.");
	     } 
	} 

}