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Thread: Little help please

  1. #1
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    Default Little help please

    import java.util.Scanner;
     
    public class Donations
    {
       public static void main(String[] args)
       {
          Scanner keyboard= new Scanner (System.in);
          String donorName;
          int donationAmount, donationQuantity=0, maxDonation=0;
     
          do
          {
     
             System.out.println("Please enter your name");
             donorName=keyboard.nextLine();
     
             System.out.println("Please enter donation amount");
             donationAmount=keyboard.nextInt();
     
             donationQuantity=donationQuantity+1;
     
             maxDonation +=donationAmount;
     
     
          }
          while (maxDonation<500);
     
          System.out.println("It took " + donationQuantity + " donations to reach the 500");
     
     
       }//main
    }//class

    For some reason when the program loops the second time for a new customer to enter the name, the amount prompt appears directly below it, therefore not being able to enter the 2nd name. Any ideas guys?
    Last edited by Norm; February 13th, 2013 at 05:02 PM. Reason: changed quote to code tag

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Little help please

    The Scanner class's nextInt() method leaves the lineend character in its buffer. The next call to the nextLine() method reads and returns that lineend character as an empty line.
    Add a call to the nextLine() method after calling the nextInt() method to read the lineend character.

    See also Do While Loop
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Little help please

    I changed them about, now this is my output:

    Please enter donation amount
    65

    Please enter your name
    Please enter donation amount


    Therefore wont let me enter my name, sorry I am a beginner.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Little help please

    Please post the current version of the code.

    The order of the calls won't change what the nextInt() method does. It still leaves the lineend character in its buffer.
    To see that nextLine() reads an empty line, add a println() statement to print out its value after it is read.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Little help please

    import java.util.Scanner;
     
    public class Donations
    {
       public static void main(String[] args)
       {
          Scanner keyboard= new Scanner (System.in);
          String donorName;
          int donationAmount, donationQuantity=0, maxDonation=0;
     
          do
          {
     
             System.out.println("Please enter donation amount");
             donationAmount=keyboard.nextInt();
     
             System.out.println("\nPlease enter your name");
             donorName=keyboard.nextLine();
     
     
             donationQuantity=donationQuantity+1;
     
             maxDonation +=donationAmount;
     
     
          }
          while (maxDonation<500);
     
          System.out.println("It took " + donationQuantity + " donations to reach the 500");
     
     
       }//main
    }//class

    So, why is it reading an empty line tho, why won't it wait for the user input?

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    Default Re: Little help please

    4

  7. #7
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    Default Re: Little help please

    donorName=keyboard.next(); fixed the issue instead of donorName=keyboard.nextLine();

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: Little help please

    That would work as long as the name doesn't have any spaces in it.
    If you don't understand my answer, don't ignore it, ask a question.