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How do i get my new value to go back through the if statements

I'm trying to get the amount of days until the meeting to go back and print out the day the new meeting is on but I keep getting an integer instead of the string.
import java.util.Scanner;
public class NextMeeting {
public static void main(String [] args) {
int day, daysToMeeting = 0;
Scanner scan = new Scanner(System.in);
System.out.println("Enter the day of the week 0-6: ");
day = scan.nextInt();
System.out.println("Enter the days to meeting: ");
daysToMeeting = scan.nextInt();
if (day == 0) {
System.out.println("Today is Sunday");
} else if (day == 1) {
System.out.println("Today is Monday");
}
else if (day == 2) {
System.out.println("Today is Tuesday");
}
else if (day == 3) {
System.out.println("Today is Wednesday");
}
else if (day == 4) {
System.out.println("Today is Thursday");
}
else if (day == 5) {
System.out.println("Today is Friday");
}
else if (day == 6) {
System.out.println("Today is Saturday");
}
System.out.println("Today is: " + day);
if( daysToMeeting >= 6) {
day = daysToMeeting - 7;
}
else {
day = day + 6;
}
System.out.println("Days to the meeting is " + daysToMeeting + " +days.");
System.out.println("Meeting day is : " + Integer.toString(day));
}
}
The output for days is still 3 but we need to get it to print out Wednesday. I don't know how to make that happen.

You can use DayOfWeek enum.
System.out.println("Meeting day is : " + DayOfWeek.of(day).toString());
You can also remove nested if-else statement and use DayOfWeek enum to display "Today is xyz-day".

You are printing out integers because day is an int. It may be inefficient but an easy fix is to create a String variable and in another if-statement block below the daysToMeeting if-else block, assign the String to each corresponding integer, such as
String meetingDay;
if(day == 1){
meetingDay = "Monday";
}
and then print out using the String variable.
System.out.println("Meeting day is : " + meetingDay);

Just create a method which will return the day of week String by passing the day int. Then print the result.
public String intToDayName(int day) {
if(day > 6) {
day = day % 7;
}
if (day == 0) {
return "Sunday";
} else if (day == 1) {
return "Monday";
}
else if (day == 2) {
return "Tuesday";
}
else if (day == 3) {
return "Wednesday";
}
else if (day == 4) {
return "Thursday";
}
else if (day == 5) {
return "Friday";
}
else if (day == 6) {
return "Saturday";
}
return "Error";
}
calling it in your prints:
System.out.println("Meeting day is : " + intToDayName(daysToMeeting));
System.out.println("Today is " + intToDayName(day));
If you actually want your code to go back and print the first if-else statements then I suggest looping.

Having problems with consistency [closed]

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Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 7 years ago.
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I'm having issues with my program. Namely in that when I enter a value to say what day it will be a few days from now, it sometimes work, and other times it doesn't. I'm not sure what the problem is... Bear with me I'm still learning.
Thanks in advance
import java.util.*;
public class pooped {
static Scanner console = new Scanner(System.in);
public static void main(String[] args) {
int day;
int june;
int dates;
System.out.println(" Days of the week are numbered 0 - 6 " +
"From Sunday to Saturday, enter a number now");
day = console.nextInt();
int kill = day;
System.out.println("Enter the number of days forward: ");
dates = console.nextInt();
printday(day);
day = addDay(day);
printday(day);
day = removeDay(day);
printday(day);
dates = count(dates);
printday(kill + dates);
}
public static int count(int dates) {
if (dates > 6){
dates = (dates % 6);
}
System.out.println("That many days out is: ");
return dates;
}
private static int addDay(int day) {
day++;
System.out.println("The next day is: ");
if (day > 6) {
day = 0;
}
return day;
}
private static int removeDay(int day) {
day = day - 2;
System.out.println("The previous day is: ");
if (day == 0) {
day = 6;
}
return day;
}
public static boolean isWeek(int day) {
return day >= 0 && day <= 6;
}
public static void printday(int day) {
switch (day)
{
case 0:
System.out.println("Sunday");
break;
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
default:
break;
}
}
}

You should mod by 7, not 6. Modding by 6 will only yield values 0-5.
dates %= 7;
So, whenever you add or subtract from a variable that should remain between 0-6, perform the above mod, by 7.
Full source
public class Main {
static Scanner console = new Scanner(System.in);
public static void main(String[] args) {
int day;
int june;
int dates;
System.out.println(" Days of the week are numbered 0 - 6 "
+ "From Sunday to Saturday, enter a number now");
day = console.nextInt();
System.out.println("Enter the number of days forward: ");
dates = console.nextInt();
printday(day);
printday(addDay(day));
printday(removeDay(day));
printday(day + count(dates));
}
public static int count(int dates) {
dates %= 7;
System.out.println("That many days out is: ");
return dates;
}
private static int addDay(int day) {
day++;
day %= 7;
System.out.println("The next day is: ");
return day;
}
private static int removeDay(int day) {
day--;
day += 7;
day %= 7;
System.out.println("The next day is: ");
return day;
}
public static boolean isWeek(int day) {
return day >= 0 && day <= 6;
}
public static void printday(int day) {
switch (day) {
case 0:
System.out.println("Sunday");
break;
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
default:
break;
}
}
}

How to incorporate error message in the program below?

I'm an beginner IT11 student and we're supposed to make a program that will read in the number of the day, the month, and the year a person was born.
For example, someone born on September 3, 1982, would enter the numbers
3, 9, and 1982
into three separate JOP.showInputDialogs.
If an incorrect value is entered, the program should give a very specific error message explaining why it is invalid and ask the user to enter the information again. A user should never have to reenter more than one of the values when an invalid entry is made (example, if the day is invalid, the user should only have to reenter the day, not the month or the year).
The program will then tell the person their birthdate with the following format:
You were born September 3, 1982.
The format of the date must be as shown above.
Important
- The program MUST do error checking for invalid months (valid between 1 and 12)
- The program MUST do error checking for invalid years (valid >= 1800)
- The program MUST do error checking for invalid day of month (valid between 1 and maxDay in month (30, 31, 28 or 29))
- The program MUST only allow Feb 29 on LEAP YEARS only.
The part I'm stuck on is incorporating an error message for invalid dates. For example, if I were to input April 31, the program should return an error message saying "April only has 30 days", etc. How do I do that? Here is what I've got so far.
import javax.swing.*;
public class A6DateProgram {
public static void main(String[] args) {
int year = getYearFromUser(); //gets user input for year
int month = getMonthFromUser(); //gets user input for month
int day = getDateFromUser(month, year); //gets user input for date
//tells the user their birthdate
System.out.println("You were born " + Months(month) + " " + day + ", "+ year + " " + ".");
} //main
//asks user for year
public static int getYearFromUser(){
String year; //asks user for year
int year1 = 0;
String errorMessage = "";
boolean isLeap = false;
do{
year = JOptionPane.showInputDialog(errorMessage + "Please enter the year you were born in. (>1800)");
if (year == null) {
System.out.println("You clicked cancel");
System.exit(0);
}
// parse string to an int
try {
year1 = Integer.parseInt(year); //parses recieved number to an int
} catch (Exception e) {
errorMessage = "Invalid integer\n"; //if user does not input valid integer
continue; //continues to condition [while(true);]
} // catch
isLeap = validateYear(year1);
if(year1 < 1800 || year1 > 2400){ //number limitation
errorMessage = "Your number must be greater than 1800 or less than 2400. \n"; //if user does not input a valid integer between limit
continue; //continues to condition [while(true);]
}
break;
} while(true);
return year1;
} //getYearFromUser
public static boolean validateYear(int year){
return (year % 400 == 0 ) ? true : (year%100 == 0)? false : (year % 4 == 0)? true: false;
}
//asks user for month
public static int getMonthFromUser(){
String month;
int num = 0;
String errorMessage = "";
do{
month = JOptionPane.showInputDialog(errorMessage + "Please enter the month you were born in as a valid integer. (ex. January = 1)");
if (month == null) {
System.out.println("You clicked cancel");
System.exit(0);
}
// parse string to an int
try {
num = Integer.parseInt(month);
} catch (Exception e) {
errorMessage = "Invalid integer\n";
continue; //continues to condition [while(true);]
} // catch
if(num > 12 || num < 1){
errorMessage = "A year only has 12 months. \n";
continue; //continues to condition [while(true);]
}
break;
} while(true);
return num;
} //getMonthFromUser
//asks user for date
public static int getDateFromUser(int month, int year){
String date;
int day = 0;
String errorMessage = "";
boolean ToF = false;
do{
date = JOptionPane.showInputDialog(errorMessage + "Please enter the date you were born in. (1-31)");
//user clicks cancel
if (date == null) {
System.out.println("You clicked cancel");
System.exit(0);
}
// parse string to an int
try {
day = Integer.parseInt(date);
} catch (Exception e) {
errorMessage = "Invalid integer\n";
continue; //continues to condition [while(true);]
} // catch
ToF = validate(year, month, day); //giving boolean ToF a method to validate the day
if(ToF == false){
errorMessage = "The month you input does not have that date. \n";
continue; //continues to condition [while(true);]
}
break;
} while(true); //do
return day;
} //getDateFromUser
public static boolean validate(int year, int month, int day){
switch(month){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
if(day < 1 || day > 31)
return false;
break;
case 2:
if(year%4 == 0 || (year%400 == 0 && year%100 != 0)){
if (day < 1 || day > 29)
return false;
}else{
if (day < 1 || day > 28)
return false;
}
break;
case 4:
case 6:
case 9:
case 11:
if(day < 1 || day > 30)
return false;
break;
}
return true;
} //validate
//resonse to user input for month
public static String Months(int month) {
switch (month) {
case 1: return "January";
case 2: return "Febrary";
case 3: return "March";
case 4: return "April";
case 5: return "May";
case 6: return "June";
case 7: return "July";
case 8: return "August";
case 9: return "September";
case 10: return "October";
case 11: return "November";
case 12: return "December";
default: return "Invalid";
} // switch
} //Months
} //A6DateProgram Class

Try with SimpleDateFormat()
String date = "3";
String month = "9";
String year = "1980";
SimpleDateFormat sdf1 = new SimpleDateFormat("ddMMyyyy");
SimpleDateFormat sdf2 = new SimpleDateFormat("MMMM dd, yyyy");
Date date1 = sdf1.parse((Integer.parseInt(date)<10?"0"+date:date)+(Integer.parseInt(month)<10?"0"+month:month)+year);
String ansStr = sdf2.format(date1);
System.out.println("You were born "+ansStr);
If you enter an invail date it automatically take the next date.
Eaxmple if the input is 29-02-2014 it will take as 01-03-2014

Change an " If else statement " to a switch statement

was wondering if anyone could help me change an " If else statement " to a "switch"
Well c the pseudo code is.
Please help .
IF month is 1,2, or 3, season = "Winter
Else if month is 4, 5, or 6, season = "Spring"
Else if month is 7,8, 9, season = "Summer"
Else if month is 10,11, or 12, season = "Fall"
If season is "Winter", season = "Spring"
Else if season is "Spring", season = "Summer"
Else if season is "Summer", season = "Fall"
Else season = "Winter"
2.My code is
import java.util.Scanner;
public class mylab
{
public static void main(String[] args)
{ Scanner in = new Scanner(System.in);
int month;
int day;
String season= "seasons";
System.out.print("type a two digit month");
System.out.print(" and day");
month = in.nextInt();
day = in.nextInt();
String fall = " fall";
String winter = " winter ";
String summer = " summer";
String spring = " spring";
System.out.print(" Month="+ month +" Day= "+day);
if( month <= 3)
{ System.out.println(" Winter");
season= winter; }
else if ( month <=6)
{ System.out.println(" Spring ");
season=spring; }
else if ( month<= 9)
{ System.out.println(" Summer ");
season= spring; }
else if ( month<=12)
{ System.out.println(" Fall");
season= fall; }
3.I just need to change the 1st part to a switch statement.
This is what I have so far
switch( month )
{ case 1: season= " winter";if ( month <= 3) ;break;
case 2: season= " spring"; if ( month <= 6) ;break;
case 3: season = " summer"; if (month <= 9); break;
case 4: season= " fall"; if (month <= 12); break ;
}
,but it is not working .

IF month is 1,2, or 3, season = "Winter
Would simply become...
String season = "";
switch (month) {
case 1:
case 2:
case 3:
season = "Winter";
break;
case ...: // etc...
}
case will fall through to the next case unless there is a break
Take a look at The switch Statement for more details

How about some integer division?
switch( (month + 2) / 12 ) {
case 1:
// winter
break;
case 2:
// spring
break; // WOOHOO SPRING BREAK!
case 3:
// summer
break;
case 4:
// fall
break; // winter is coming...
default:
break;
}

Hints:
You need two switch statements. One for the first if/else chain, and one for the second. (Though you could easily fold the two chains into one!)
The syntax of a switch statement is illustrated in the Java Tutorial here.
The following statement does nothing:
if ( month <= 3) ;
It says "test if month is less or equal to 3, and then execute the empty statement. This is a "gotcha!" in Java syntax ... and one of the reasons that some people think that you should always use curly brackets with if and loop statements in Java and similar languages.

Finding the count of an variable using switch Statment

In this application I have to enter the total sales of every month from Jan 2010 to Dec 2014.(48 inputs)
I need to display the month of the year which has min sales and max sales.
The problem is I am not getting the desired output.
package xxxxxxx;
import java.util.Scanner;
public class test{
public static void main ( String [] args ){
Scanner keyboard = new Scanner( System.in );
int getInt=0;
int count = 0;
int sum = 0;
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
double average = 0;
boolean number = true;
int choice=0;
while ( number == true )
{
System.out.println("Enter A Sales for a month : ");
getInt = keyboard.nextInt();
choice++;
if ( getInt < 0 )
number = false;
else
{
if ( getInt > max )
max = getInt;
if ( getInt <= min )
min = getInt;
sum += getInt;
count++;
}
}
int maxy=choice%12;
switch(maxy){
case 1 :
System.out.println("It's Month is : "+" Januray of 2010 !"+max);
break;
case 2 :
System.out.println("It's Month is : "+" Februray of 2010 !"+max);
break;
case 3 :
System.out.println("It's month is : "+" March of 2010 !"+max);
break;
case 4 :
System.out.println("It's month is : "+" April of 2010 !"+max);
break;
case 5 :
System.out.println("It's month is : "+" May of 2010 ! "+max);
.
.
.
}
average = ( sum ) / ( count );
System.out.println( "Sum = " + sum );
System.out.println( "Average = " + average );
System.out.println( "Max = " + max );
System.out.println( "Minimum = " + min );
}
}

I believe what you're wanting is the following if you have to use a switch and don't want to use something like a Date formatting class:
int year = 2010 + choice / 12;
int month = 1 + choice % 12;
switch (month) {
case 1: System.out.println("January " + year);
break;
case 2: System.out.println("February " + year);
break;
// so on
}
BTW I don't see anything in your code that restricts the # of inputs to 48 like you say is a spec. You can easily add this to your while loop:
while (number == true && count < 48) {
}
And further reduce it to:
while (number && count < 48) {
}
Because booleans are a boolean themselves you do not need to check if (value == true) and if (value == false), rather you should check if (value) and if (!value).
However your number variable is actually redundant and can be removed entirely if you use a break. I also think you mean to exit before incrementing choice IE looks like the user enters a negative number to end early. If you increment the control this will screw up your average. It looks like you created your second variable count for this purpose but I don't think you need it. You just need to refactor.
I also recommend checking count before doing your average. In your code right now the user can abort the loop immediately and you'll get a divide by zero.
do {
System.out.println("Enter a sales for the month: ");
getInt = keyboard.nextInt();
if (getInt < 0) break;
if (getInt > max) max = getInt;
if (getInt < min) min = getInt;
sum += getInt;
count++;
} while (count < 48);
if (count == 0) {
System.out.println("No sales ever!");
return;
}
int year = 2010 + count / 12;
int month = 1 + count % 12;

To get the current month just use this
int month = Calendar.getInstance().get(Calendar.MONTH) + 1;
and the year is
int year = Calendar.getInstance().get(Calendar.YEAR);
putting it all together
private static String getMonthName(int month) {
switch (month - 1) {
case Calendar.JANUARY: return "January";
case Calendar.FEBRUARY: return "February";
case Calendar.MARCH: return "March";
case Calendar.APRIL: return "April";
case Calendar.MAY: return "May";
case Calendar.JUNE: return "June";
case Calendar.JULY: return "July";
case Calendar.AUGUST: return "August";
case Calendar.SEPTEMBER: return "September";
case Calendar.OCTOBER: return "October";
case Calendar.NOVEMBER: return "November";
case Calendar.DECEMBER: return "December";
default:
System.err.println("month " + month
+ " unknown, use January.");
return "January";
}
}
public static void main(String[] args)
throws IOException {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, -48);
for (int i = 0; i <= 48; i++) {
int month = cal.get(Calendar.MONTH) + 1;
int year = cal.get(Calendar.YEAR);
System.out.println(getMonthName(month) + " " + year);
cal.add(Calendar.MONTH, 1);
}
}