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Thread: If no search results found..display a message....but how? is the question.

  1. #1
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    Default If no search results found..display a message....but how? is the question.

    Hey guys,

    First time poster so quick background on my project. I've been asked to make a program that accesses a file and outputs what you've searched for. The file contains a list of the worlds capitols and their population. If you enter "North" it will spit out anything with that word in it, obviously. Problem is if there is no search result it does nothing...I want it to be able to display a message saying "Sorry, no results were found" but don't know where to start apart from the fact I know it would be a boolean varibale and an if statement in the end..guidance would be greatly appreciated

    Code was written in Bluej
    Source:

    import java.util.Scanner;
    import java.io.File;
    import java.io.FileNotFoundException;
     
     
    public class Capitals
    {
        public static void main(String[] args) throws FileNotFoundException
        {
            // ask the user for the search string
            Scanner keyboard = new Scanner(System.in);
            System.out.print("Please enter part of the country name: ");
            String searchString = keyboard.next().trim().toLowerCase();
     
            // open the data file
            File countryFile = new File("CountryData.csv");
     
            // create a scanner from the file
            Scanner countryInput = new Scanner(countryFile);
     
            // set up the scanner to use "," as the delimiter
            countryInput.useDelimiter("[\\r,]");
     
            // read one line of data at a time, processing each line
            while(countryInput.hasNext())
            {
                // read the 3 parts of the line
     
                // first the country and capital
                String country = countryInput.next();
                String capital = countryInput.next(); 
     
                // then the population info
                int population = countryInput.nextInt();
     
                // print out the info if the country name contains the input search string
                if(country.toLowerCase().contains(searchString))
                {
                    System.out.println(country + "\t" +
                        capital + "\t" + population);
                }
            }
     
            // be polite and close the file
            countryInput.close();
        }
    }
    __________________________________________________ __________________________________

    Thank you in advance


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: If no search results found..display a message....but how? is the question.

    be a boolean varibale and an if statement in the end.
    That should do it. What have you tried?
    Define the variable before the search loop
    set it inside the loop if any matches found
    after the loop, test it and print the message
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: If no search results found..display a message....but how? is the question.

    I tried doing this:

    if(country.toLowerCase().contains(searchString))
                {
                    System.out.println(country + "\t" +
                        capital + "\t" + population);
     
                }
                else
                {     System.out.println("Sorry, no results were found");
     
                }

    But then it just posts "Sorry, no results were found" regardless of what I put in. Also it posts repeatedly...I'm guessing its looping infinitely?

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    Default Re: If no search results found..display a message....but how? is the question.

    That looks like the message is displayed inside the loop. It will display a message for every item that does not match.

    Did you see this pseudo code in my last post?
    Define the boolean variable before the search loop
    set its value inside the loop if any matches found
    after the loop, test its value and print the message
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: If no search results found..display a message....but how? is the question.

    How would I set it's value in the loop?? - That's what confuses me.

  6. #6
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    Default Re: If no search results found..display a message....but how? is the question.

    How would I set it's value
    What kind of variable are you setting?
    Give it a value so that when the loop exits you will know if a match was found.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: If no search results found..display a message....but how? is the question.

    I've set:
    boolean resultFound

    I'm guessing the next step would be to put this inside the loop:

    resultFound= something

    and then at the end:

    if(!resultFound)
           {
                System.out.println("Sorry, no results were found.");
     
            }

  8. #8
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    Default Re: If no search results found..display a message....but how? is the question.

    What happens when you compile and execute the code? Are there errors? Did it work as desired?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: If no search results found..display a message....but how? is the question.

    I haven't compiled yet..still trying to figure out how to work it into the loop haha

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