DaysInEachMonth.java

import java.util.Scanner;

public class DaysInEachMonth {

    public static void main(String args[]){

        Scanner keyboard = new Scanner(System.in);
        int month, numberOfDays = 0;
        boolean isLeapYear;

        System.out.print("Which month? ");
        month = keyboard.nextInt();

        switch (month){
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                numberOfDays = 31;
                break;

            case 4:
            case 6:
            case 9:
            case 11:
                numberOfDays = 30;
                break;

            case 2:
                System.out.print("Leap year (true/false)? ");
                isLeapYear = keyboard.nextBoolean();
                if(isLeapYear){
                    numberOfDays = 29;
                }else {
                    numberOfDays = 28;
                }
        }

        System.out.println(numberOfDays + " days");
        keyboard.close();
    }
}