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Thread: Whatīs wrong?

  1. #1
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    Default Whatīs wrong?

    First of all iīm a begginer and i know this code is very basic, but i really want to know the problem and how to fix it. There ar no compile error or logical errors i think, but nothing appears on the console. Can someone help? Thanks.

    import java.util.Scanner;

    public class A {
    public static void main(String args[]){

    Scanner input = new Scanner(System.in);
    System.out.print("Enter the month: ");
    String month = input.nextLine();
    System.out.print("Enter the year: ");
    int year = input.nextInt();

    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)){ // if it is a leap year
    if (month == "January")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "February")
    System.out.print(month + " " + year + " has " + "29 days");
    else if (month == "March")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "April")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "May")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "June")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "July")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "August")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "September")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "October")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "November")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "December")
    System.out.print(month + " " + year + " has " + "31 days");
    }
    else { // If itīs not a leap year
    if (month == "January")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "February")
    System.out.print(month + " " + year + " has " + "28 days");
    else if (month == "March")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "April")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "May")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "June")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "July")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "August")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "September")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "October")
    System.out.print(month + " " + year + " has " + "31 days");
    else if (month == "November")
    System.out.print(month + " " + year + " has " + "30 days");
    else if (month == "December")
    System.out.print(month + " " + year + " has " + "31 days");
    }
    }
    }


  2. #2
    Senior Member
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    Default Re: Whatīs wrong?

    When comparing strings you NEED to use the "equals" method instead of "==".
    The == operator can only be used for primitive data (int, float, char, etc)

  3. #3
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    Default Re: Whatīs wrong?

    I tried to change to equals as you said but then this error occurs:" Type mismatch: cannot convert from String to boolean"

  4. #4
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    Default Re: Whatīs wrong?

    Please post your code using code or highlight tags as explained near the top of this topic.

    Don't tell us what you tried to do, SHOW us (post) what you tried to do with the resulting errors AND post your code correctly.

  5. The Following User Says Thank You to GregBrannon For This Useful Post:

    Clef (August 13th, 2014)

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