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Thread: My First program, I need help.

  1. #1
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    Default My First program, I need help.

    I'm trying to make it so you type in you username, then you type it in later
    and if the two match then it prints logged in succesfully, but it's basically saying the two don't match..?



    import java.util.Scanner;
    class Der{

    public static void main(String[]arguments)

    {

    Scanner key = new Scanner(System.in);
    System.out.println("Set your Username: ");
    String UserName = key.nextLine();
    Scanner key2 = new Scanner(System.in);
    System.out.println("Enter your UserName");
    String EnteredUserName = key2.nextLine();

    if (EnteredUserName == UserName)

    {

    System.out.print("Logged in Successfully");
    }

    }
    }


  2. #2
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    Default Re: My First program, I need help.

    Hello Tyridge77!
    You should use the String's equals() method instead of the == operator when comparing Strings.
    And for your next posts be sure you use the code tags to get highlighting in your code.
    Last edited by andreas90; June 23rd, 2012 at 03:48 AM.

  3. #3
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    Default Re: My First program, I need help.

    Quote Originally Posted by andreas90 View Post
    Hello Tyridge77!
    You should use the String's equals() method instead of the == operator when comparing Strings.
    And for your next posts be sure you use the code tags to get highlighting in your code.

    I tried the equals mehod, and it still isn't working..



    ------

     
     
    import java.util.Scanner;
    class Der{
     
    	public static void main(String[]arguments)
     
    	{
     
    		Scanner key = new Scanner(System.in);
    		System.out.println("Set your Username: ");
    	String	UserName = key.nextLine();
     Scanner key2 = new Scanner(System.in);
     System.out.println("Enter your UserName");
     String EnteredUserName = key2.nextLine();
     
     
    String a = key.nextLine();
    String b = key2.nextLine();
     
     
    if(a.equals(b)){
     
    	 System.out.print("Logged in Successfully");
     }
     
     
    }
     
     
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: My First program, I need help.

    Try debugging the code by adding a println statement that prints out the values of a and b so you can see what the computer sees:
    System.out.println("a="+a + "<\nb=" + b +"<");

    Add this just before the if statement.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: My First program, I need help.

    Quote Originally Posted by Tyridge77 View Post
    I tried the equals mehod, and it still isn't working..
    Your code is working for me as expected. You are probably entering different Strings for a and b (a space after one of the inputs might be the problem). Try printing them as Norm suggested and you 'll find out what the problem is.

  6. #6
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    Default Re: My First program, I need help.

    //You do not need to create key and key2. One will work.

    import java.util.*;

    class Application{

    public static void main(String[]arguments)

    {

    Scanner key = new Scanner(System.in);
    System.out.print("Set your Username: ");
    String UserName = key.nextLine();
    System.out.print("Enter your UserName");
    String EnteredUserName = key.nextLine();




    if(UserName.equals(EnteredUserName)){

    System.out.print("Logged in Successfully");
    }
    else
    System.out.println("Unsucessful"); just to check whether it works or not you can delete it later

    }
    }

  7. #7
    Super Moderator Norm's Avatar
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    Default Re: My First program, I need help.

    @kindk12
    Please Edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.

    Also use code that follows the java programming standards.
    If you don't understand my answer, don't ignore it, ask a question.

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