Determining the Number of Days in a Month
This section will show the way of counting the number
of days of a month in the specified year. Following program takes the year as
input through the keyboard and shows the number of days in the February month of
the mentioned year if the year is valid other it will show the error message and
terminate the program.
Code Description:
GregorianCalendar(year, Calendar.FEBRUARY, 1):
Above is the constructor of the GregorianCalendar class which create
an instance for that. Year and month are specified in the constructor to create
instance for finding the number of days in that month of the specified year.
Here, the constructor takes three arguments as follows:
- First is the year.
- Second is the month (February).
- And third is the initial date value.
Calendar.getActualMaximum(Calendar.DAY_OF_MONTH):
Above method finds and returns the maximum date value in the specified month
of the specific year. It returns a integer value.
Here is the code of the program:
import java.util.*;
import java.io.*;
public class GettingDaysInMonth{
public static void main(String[] args) throws IOException{
int year = 1;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter year : ");
try{
year = Integer.parseInt(in.readLine());
if (year < 1900 || year > 2100){
System.out.println("Please enter year greater than 1900 and less than 2100.");
System.exit(0);
}
}
catch(NumberFormatException ne){
System.out.print(ne.getMessage() + " is not a valid entry.");
System.out.println("Please enter a four digit number.");
System.exit(0);
}
Calendar cal = new GregorianCalendar(year, Calendar.FEBRUARY, 1);
int days = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
System.out.print("Number of days : " + days);
}
}
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