Question

求JAVA万年历源代码并有注释，有流程分析图更好。

Answer 1

package chapter1;
import java.util.*;
public class Calendar {

/**
* @param args
*/
public static void main(String[] args) {
int count1 = 0;
int count2 = 0;

Scanner sc = new Scanner(System.in);
System.out.println("*********************欢迎使用万年历*********************");
System.out.print("请输入年份:");
int year = sc.nextInt();
System.out.print("请输入月份:");
int mon = sc.nextInt();
System.out.println("星期日\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六\t");
//计算这个月月初是该年的第sum天
int sum = 0;
switch(mon)
{
case 12:
sum += 30;
case 11:
sum += 31;
case 10:
sum += 30;
case 9:
sum += 31;
case 8:
sum+= 30;
case 7:
sum += 31;
case 6:
sum += 31;
case 5:
sum += 30;
case 4:
sum += 31;
case 3:
sum += 28;
case 2:
sum += 31;
case 1:
sum += 0;
}
if(year%400 == 0||year%4 == 0&&year%100 != 0){
if(mon >2){
sum += 1;
}
}
//计算距离1900年1月1日有几天
for(int i =1900;i < year;i++){
//判断闰年和非闰年各有几年
if(i%400 == 0||i%4 == 0&&i%100 != 0){
count1++;
}
else
count2++;
}
sum = sum + count1*366 + count2*365;
//计算所输入月份的第一天是星期几
int week = (sum + 1)%7;
//打印
if(mon == 1||mon == 3||mon == 5||mon == 7||mon == 8||mon == 10||mon == 12){

for( int j = 0;j < week;j++ ){
System.out.print("\t");

}
for(int day = 1;day <= 31;day++){
System.out.print(day + "\t");
if((week + day) % 7 == 0)
{
System.out.println("");
}
}

}
if(mon == 4||mon == 6||mon == 9||mon == 11){
for( int j = 0;j < week;j++ ){
System.out.print("\t");
}
for(int day = 1;day <= 30;day++){
System.out.print(day + "\t");
if((week + day) % 7 == 0)
{
System.out.println("");
}
}
}
if(mon == 2){
int k;
if(year%400 == 0||year%4 == 0&&year%100 != 0){
k =1;
}
else k = 0;
for( int j = 0;j < week;j++ ){
System.out.print("\t");
}
for(int day = 1;day <= 28+k;day++){
System.out.print(day + "\t");
if((week + day) % 7 == 0)
{
System.out.println("");
}
}
}

}

}