Question

Write a program that takes a date as input and outputs the date's season. The input is a string to represent the month and an int to represent the day.

Ex: If the input is April 11, the output is:

spring
In addition, check if the string and int are valid (an actual month and day).

Ex: If the input is invalid, the output is:

invalid
The dates for each season are:
spring: March 20 - June 20
summer: June 21 - September 21
autumn: September 22 - December 20
winter: December 21 - March 19

My code is constantly outputting 'invalid, regardless of the date input.

import java.util.Scanner;

public class LabProgram {
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
String inputMonth;
int inputDay;


inputMonth = scnr.next();
inputDay = scnr.nextInt();
if((inputMonth=="March"&&inputDay>19)||inputMonth=="April"||inputMonth=="May"||(inputMonth=="June"&&inputDay<21))
{
System.out.println("spring");
}
else if((inputMonth=="June"&&inputDay>20)||inputMonth=="July"||inputMonth=="August"||(inputMonth=="September"&&inputDay<22))
{
System.out.println("summer");
}
else if((inputMonth=="September"&&inputDay>21)||inputMonth=="October"||inputMonth=="November"||(inputMonth=="December"&&inputDay<21))
{
System.out.println("autumn");
}
else if((inputMonth=="December"&&inputDay>20)||inputMonth=="January"||inputMonth=="February"||(inputMonth=="March"&&inputDay<20))
{
System.out.println("winter");
}
else
{
System.out.println("invalid");

} }
}

Answer 1

The problem here is you are comparing month names with == , in case of strings there is a difference between comparing with == and .equals. So I have changed that code please check now

Program:

import java.util.Scanner;

public class LabProgram {

public static void main(String[] args) {

Scanner scnr = new Scanner(System.in);

String inputMonth;

int inputDay;

System.out.print("Enter month:");

inputMonth = scnr.next();

System.out.print("Enter day of month");

inputDay = scnr.nextInt();

if((inputMonth.equalsIgnoreCase("march")&&inputDay>19)||inputMonth.equalsIgnoreCase("april")||inputMonth=="may"||(inputMonth.equalsIgnoreCase("june")&&inputDay<21))

{

System.out.println("spring");

}

else if((inputMonth.equalsIgnoreCase("june")&&inputDay>20)||inputMonth.equalsIgnoreCase("july")||inputMonth=="august"||(inputMonth.equalsIgnoreCase("september")&&inputDay<22))

{

System.out.println("summer");

}

else if((inputMonth.equalsIgnoreCase("september")&&inputDay>21)||inputMonth.equalsIgnoreCase("october")||inputMonth.equalsIgnoreCase("november")||(inputMonth.equalsIgnoreCase("December")&&inputDay<21))

{

System.out.println("autumn");

}

else if((inputMonth.equalsIgnoreCase("december")&&inputDay>20)||inputMonth.equalsIgnoreCase("january")||inputMonth.equalsIgnoreCase("february")||(inputMonth.equalsIgnoreCase("march")&&inputDay<20))

{

System.out.println("winter");

}

else

{

System.out.println("invalid");

} }

}

Output: