Switch Statement with String in Java 7

Following code represents one of the requirements in which you could use Switch statement to work with String in Java. This should be noted that this feature got newly introduced in Java 7.

Below is the class CalendarUtil which has a method namely numberOfDays to calculate number of days in a month of a given year. Note the logic for february month which will vary based on leap year logic. Rest of the days count remain same in different months irrespective of years.

public class CalendarUtil {

public static int numberOfDays(int year, String month) {

int numberOfDays = -1;

switch (month) {

case “january”:
numberOfDays = 31;
break;

case “february”:
if (year % 4 == 0) {
numberOfDays = 29;
} else {
numberOfDays = 28;
}
break;

case “march”:
numberOfDays = 31;
break;

case “april”:
numberOfDays = 30;
break;

case “may”:
numberOfDays = 31;
break;
// Likewise you could do upto december month

default:
}

return numberOfDays;
}

public static void main(String[] args) {

String month = “february”;
int year = 2012;

System.out.println(“Number of days in ” + month + ” of the year ”
+ String.valueOf(year) + ” = ”
+ CalendarUtil.numberOfDays(year, month));

}

}