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85 lines (80 loc) · 2.51 KB
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import java.util.Scanner;
public class PrintCalendar {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.print("Enter full year(e.g., 2001): ");
int year=input.nextInt();
System.out.print("Enter month in number between 1 and 12: ");
int month=input.nextInt();
printMonth(year, month);
}
public static void printMonth(int year,int month) {
printMonthTitle(year, month);
printMonthBody(year, month);
}
public static void printMonthTitle(int year,int month) {
System.out.println(" "+getMonthName(month)+" "+year);
System.out.println("---------------------------");
System.out.println(" Sun Mon Tue Wed Thu Fri Sat");
}
public static String getMonthName(int month) {
String monthName="";
switch(month) {
case 1:monthName="January";break;
case 2:monthName="February";break;
case 3:monthName="March";break;
case 4:monthName="April";break;
case 5:monthName="May";break;
case 6:monthName="June";break;
case 7:monthName="July";break;
case 8:monthName="August";break;
case 9:monthName="September";break;
case 10:monthName="October";break;
case 11:monthName="November";break;
case 12:monthName="December";break;
}
return monthName;
}
public static void printMonthBody(int year,int month) {
int startDay=getStartDay(year, month);
int numberOfDaysInMonth=getNumberOfDaysInMonth(year, month);
int i=0;
for(i=0;i<startDay;i++)
System.out.print(" ");
for(i=1;i<=numberOfDaysInMonth;i++){
System.out.printf("%4d",i);
if((i+startDay)%7==0)
System.out.println();
}
System.out.println();
}
public static int getStartDay(int year,int month) {
final int START_DAY_FOR_JAN_1_1800=3;
int totalNumberOfDays=getTotalNumberOfDays(year, month);
return(totalNumberOfDays+START_DAY_FOR_JAN_1_1800)%7;
}
public static int getTotalNumberOfDays(int year,int month) {
int total=0;
for (int i=1800;i<year;i++) {
if(isLeapYear(i))
total=total+366;
else
total=total+365;
}
for(int i=1;i<month;i++)
total=total+getNumberOfDaysInMonth(year, i);
return total;
}
public static int getNumberOfDaysInMonth(int year,int month) {
if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
return 31;
if(month==4||month==6||month==9||month==11)
return 30;
if(month==2)
return isLeapYear(year)?29:28;
return 0;
}
public static boolean isLeapYear(int year) {
return year%400==0||(year%4==0&&year%100!=0);
}
}