date.java

一些Java的小的应用程序

/**输入两个年份求出它们间的天数*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Date {
	public static void main(String args[]){
		try{BufferedReader input=new BufferedReader
			(new InputStreamReader(System.in));
		int year1,month1,day1;
		System.out.println("输入年份:");
		 year1=Integer.parseInt(input.readLine());
		 if(year1<0)throw new InputException();
			System.out.println("输入月份:");
		 month1=Integer.parseInt(input.readLine());
			if(month1>12)throw new MonthException();
			System.out.println("输入号数:");
			day1=Integer.parseInt(input.readLine());
			if(bigmonth(month1)&day1>31)throw new DayException();
			else if(smallmonth(month1)&day1>30)throw new DayException();
			else if(leap(year1)&month1==2&day1>29 )throw new DayException();
			else if(!leap(year1)&month1==2&day1>28)throw new DayException ();
		System.out.println("输入天数：") ;
		int m=Integer.parseInt(input.readLine());
		String s=getdate(year1,month1,day1,m);
		System.out.println(s);
		System.out.println("输入另一组日期：") ;
		int year2,month2,day2;
		System.out.println("输入年份:");
		 year2=Integer.parseInt(input.readLine());
		 if(year2<0)throw new InputException();
			System.out.println("输入月份:");
		 month2=Integer.parseInt(input.readLine());
			if(month2>12)throw new MonthException();
			System.out.println("输入号数:");
			day2=Integer.parseInt(input.readLine());
			if(bigmonth(month2)&day2>31)throw new DayException();
			else if(smallmonth(month2)&day2>30)throw new DayException();
			else if(leap(year2)&month2==2&day2>29 )throw new DayException();
			else if(!leap(year2)&month2==2&day2>28)throw new DayException ();
int n=days(year1,month1,day1,year2,month2,day2);
System.out.printf("%i 年 %i 月 %i 日 与 %i 年 %i 月 %i 日相隔 %i 天。\n ",
		year1,month1,day1,year2,month2,day2,n) ;
}catch(MonthException e1){
	System.out.println(e1.getMessage());
	System.exit(0);
}catch(DayException e2){
	System.out.println(e2.getMessage());
	System.exit(0);
}catch(Exception e3){
	System.out.printf("ERROR!");
}}
public static boolean bigmonth(int n){
	switch(n){
	case 1:	case 3:case 5:case 7:case 8:case 10:case 12:return true;
	default:return false;
	}
}public static boolean smallmonth(int n){
	switch(n){
	case 4:	case 6:case 9:case 11:return true;
	default:return false;
	}
}public static boolean leap(int i){
	boolean leapyear;
	if(i%400==0|(i%100!=0&i%4==0))
		leapyear=true;
	else leapyear=false;
	return leapyear;
}public static int getday(int year,int month ,int day){
	int sum=0,sum1=0,sum2=0,sum3=0;int n=0;
	int[] a=new int[12];
	a[0]=a[2]=a[4]=a[6]=a[7]=a[9]=a[10]=a[11]=31;
	a[3]=a[5]=a[8]=a[10]=30;
	sum1=365*(year-1);
	for(int i=1;i<year;i++)if(leap(i))n++;
	if(leap(year))a[1]=29;
	for(int j=0;j<month;j++)sum2+=a[j];
	sum3=n;
	sum=sum1+sum2+sum3;
	return sum;
}public static int days(int year1,int month1,int day1,
		int year2,int month2,int day2){
int m=getday(year1,month1,day1);
int n=getday(year2,month2,day2);
return Math.abs(m-n);
}public static String getdate(int year,int month,int day,int m){
	return null;
}
}