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Thread: setting a boolean in a field when being read from a file

  1. #1
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    Default setting a boolean in a field when being read from a file

    Hello i need help i have to read in a file , but one of the tokens in the file is either yes or no depending on if the vehicle has air con or not.
    how do i change the boolean field to true if it is yes and no to false ???.

    public void readData(Scanner scanner)
    {
    group = scanner.next();
    vehID = scanner.next();
    regNo = scanner.next();
    make = scanner.next();
    model = scanner.next();
    if(scanner.next().equals("yes"))
    {
    airCon = true; // where it has to be yes or no
    }
    engineSize = scanner.nextDouble();
    fuelType = scanner.next();
    gearbox = scanner.next();
    transmission = scanner.next();
    mileage = scanner.nextInt();
    dateFirstRegistered = scanner.next();
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: setting a boolean in a field when being read from a file

    What happens when you compile and execute the code?

    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: setting a boolean in a field when being read from a file

    import java.util.*;
    public class Vehicle
    {
        // instance variables - replace the example below with your own
        private String group,vehID, regNo, make,model,fuelType,gearbox,transmission,dateFirstRegistered;
        private boolean airCon;
        private double engineSize;
        private int mileage;
     
     
     
        /**
         * Constructor for objects of class Vehicle
         */
        public Vehicle()
        {
            // initialise instance variables
             group = null;
             vehID = null;
             regNo = null;
             make = null;
     
     
     
     
        }
     
        public String getGroup()
        {
            return group;
        }
     
        public String getVehicleID()
        {
           return vehID;
     
        }
     
        public String getRegestrationNumber()
        {
            return regNo;
        }
     
        public String getMakeOfVehicle()
        {
            return make;
     
        }
     
        public void displayDetails()
        {
            System.out.println(make + model  + " Group: " + group + " Vehicle ID: " + vehID);
            System.out.println(" Air Conditioning or Climate Control : " + airCon);
            System.out.println(" Engine Size : " + engineSize  + " Fuel : " + fuelType);
            System.out.println(" Gearbox : " + gearbox + " Transmission : " + transmission);
            System.out.println(" Mileage : " + mileage + " Date First Registered : " + dateFirstRegistered);
     
     
        }
     
        public void readData(Scanner scanner)
        {
            group = scanner.next();
            vehID = scanner.next();
            regNo = scanner.next();
            make = scanner.next();
            model = scanner.next();
            String yes = scanner.next();
             System.out.println(yes);
            engineSize = scanner.nextDouble();
            fuelType = scanner.next();
            gearbox = scanner.next();
            transmission = scanner.next();
            mileage = scanner.nextInt();
            dateFirstRegistered = scanner.next();
        }
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: setting a boolean in a field when being read from a file

    What happens when you compile and execute the code?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: setting a boolean in a field when being read from a file

    it reads in the file perfect
    , but the boolean field always says false when im trying to store that data which has to be either yes or no depending on what it says on the line in the file

  6. #6
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    Default Re: setting a boolean in a field when being read from a file

    the boolean field always says false
    Read the String into a variable and print out the value of that variable to be sure that it contains the String that you think it should.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: setting a boolean in a field when being read from a file

    it does it reads both yes n no in the order of the lines which is good , but i need to store them in a boolean

  8. #8
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    Default Re: setting a boolean in a field when being read from a file

    Are you using the code shown in post#1 to set the boolean?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: setting a boolean in a field when being read from a file

    yeah i only changed it to see if it was reading the yes n no's.

  10. #10
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    Default Re: setting a boolean in a field when being read from a file

    Did it work as you wanted?

    Please post the current version of the code.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: setting a boolean in a field when being read from a file

    no it kept saying false when trying to store them
    >
    import java.util.*;
    public class Vehicle
    {
        // instance variables - replace the example below with your own
        private String group,vehID, regNo, make,model,fuelType,gearbox,transmission,dateFirstRegistered;
        private boolean airCon;
        private double engineSize;
        private int mileage;
     
     
     
        /**
         * Constructor for objects of class Vehicle
         */
        public Vehicle()
        {
            // initialise instance variables
             group = null;
             vehID = null;
             regNo = null;
             make = null;
     
     
     
     
        }
     
        public String getGroup()
        {
            return group;
        }
     
        public String getVehicleID()
        {
           return vehID;
     
        }
     
        public String getRegestrationNumber()
        {
            return regNo;
        }
     
        public String getMakeOfVehicle()
        {
            return make;
     
        }
     
        public void displayDetails()
        {
            System.out.println(make + model  + " Group: " + group + " Vehicle ID: " + vehID);
            System.out.println(" Air Conditioning or Climate Control : " + airCon);
            System.out.println(" Engine Size : " + engineSize  + " Fuel : " + fuelType);
            System.out.println(" Gearbox : " + gearbox + " Transmission : " + transmission);
            System.out.println(" Mileage : " + mileage + " Date First Registered : " + dateFirstRegistered);
     
     
        }
     
        public void readData(Scanner scanner)
        {
            group = scanner.next();
            vehID = scanner.next();
            regNo = scanner.next();
            make = scanner.next();
            model = scanner.next();
            String yes = scanner.next();
             System.out.println(yes);
             airCon = yes.equals("yes");
            engineSize = scanner.nextDouble();
            fuelType = scanner.next();
            gearbox = scanner.next();
            transmission = scanner.next();
            mileage = scanner.nextInt();
            dateFirstRegistered = scanner.next();
        }
    }

  12. #12
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    Default Re: setting a boolean in a field when being read from a file

    Does that code work? What is printed out?
    Change the println to:
           System.out.println("yes="+yes +"<");
    to see what was read and tested.
    If you don't understand my answer, don't ignore it, ask a question.

  13. #13
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    Default Re: setting a boolean in a field when being read from a file

    it prints out the yes n no in each line, so it means that it reads what i want to storee, but not store it

  14. #14
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    Default Re: setting a boolean in a field when being read from a file

    Can you copy and paste here what is printed out?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: setting a boolean in a field when being read from a file

    yes=No<
    yes=No<
    yes=No<
    yes=Yes<
    yes=Yes<
    yes=Yes<
    yes=Yes<
    yes=Yes<
    yes=No<
    yes=No<
    yes=Yes<
    yes=No<
    yes=No<
    yes=No<
    yes=No<
    yes=No<
    yes=No<
    yes=No<
    yes=Yes<
    yes=Yes<
    yes=Yes<

  16. #16
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    Default Re: setting a boolean in a field when being read from a file

    The code:
     airCon = yes.equals("yes");
    The Strings that were read:
    yes=Yes<
    yes=Yes<

    Notice the difference of case in the spelling: Y is not equal to y
    The String class has a method for comparing Strings that ignores case. Try that.
    If you don't understand my answer, don't ignore it, ask a question.

  17. The Following User Says Thank You to Norm For This Useful Post:

    ajw1993 (March 10th, 2013)

  18. #17
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    Default Re: setting a boolean in a field when being read from a file

    thank you man it works . can you do something else for me im just confused on how to write a test class on testing how to create 3 objects and adding them to an array list.

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