Chapter 3 Exercise 11, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

*3.11 (Find the number of days in a month) Write a program that prompts the user to enter the month and year and displays the number of days in the month. For example, if the user entered month 2 and year 2012, the program should display that February 2012 had 29 days. If the user entered month 3 and year 2015, the program should display that March 2015 had 31 days.

import java.util.Scanner;
 
public class ProgrammingEx3_11 {
 
 public static void main(String[] args) {
  Scanner input = new Scanner(System.in);
 
  System.out.print("Enter month and year :");
  int month = input.nextInt();
  int year = input.nextInt();
  int days = 31;
  String monthString;
 
  switch (month) {
  case 2:
   if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
    days = 29;
    break;
   }
   days = 28;
   break;
 
  case 4:
  case 6:
  case 9:
  case 11:
   days = 30;
 
  }
 
  switch (month) {
  case 1:
   monthString = "January";
   break;
  case 2:
   monthString = "February";
   break;
  case 3:
   monthString = "March";
   break;
  case 4:
   monthString = "April";
   break;
  case 5:
   monthString = "May";
   break;
  case 6:
   monthString = "June";
   break;
  case 7:
   monthString = "July";
   break;
  case 8:
   monthString = "August";
   break;
  case 9:
   monthString = "September";
   break;
  case 10:
   monthString = "October";
   break;
  case 11:
   monthString = "November";
   break;
  case 12:
   monthString = "December";
   break;
  default:
   monthString = "Invalid month";
   days = 0;
   break;
  }
 
  System.out.println(monthString + " " + year + " had " + days + " days");
 
 }
}