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Thread: Need help, cannot find error

  1. #1
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    Default Need help, cannot find error

    Here is the code:

    import java.util.ArrayList;
    /**
     * A class to model an Analyser
     * 
     * @author (XXXX) 
     * @version (1.0)
     */
    public class Analyser
    {
        // instance variables - replace the example below with your own
        public ArrayList<Sample> samples;
     
        /**
         * Constructor for objects of class Analyser
         */
        public Analyser()
        {
            // initialise instance variables
           samples = new ArrayList<Sample>();
        }
     
        /**
         * An example of a method - replace this comment with your own
         */
        public void addSample(String location, int value)
        {
            if(value >= 0) {
                samples.add(new Sample(location, value));
            }
            else {
                System.out.println("The temperature is lower than absolute zero" + "\n" + "Temperature must be zero or greater");
            }
        }
     
        public void populate()
       {
           samples = new ArrayList<Sample>();
           samples.add(new Sample("Meston" + " " + 284));
           samples.add(new Sample("Fraser Noble" + " " + 274));
           samples.add(new Sample("Edward Wright" + " " + 309));
           samples.add(new Sample("New Kings" + " " + 260));
           samples.add(new Sample("Kings College" + " " + 265));
        }
     
        public void showSamples()
        {
            int index = 0;
            while(index < samples.size()) {
                System.out.println(samples.get(index));
                index++;
            }
        }
     
        public int highestTempRecorded()
        {
            int highest = 0;
            for(int index = 0; index < samples.size(); index++) {
                if(samples.get(index).getSampleValue() > highest)
                highest = samples.get(index).getSampleValue();
            }
            System.out.println("The highest temperature recorded is:" + " " + highest);
        }
     
        public void showFaultySensors()
        {
            int faultyLow = 260;
            int faultyHigh = 309;
            for(int index = 0; index < sample.size(); index++)
                if(samples.get.index().getSampleValue() < faultyLow) {
                    faultyLow = samples.get(index).getSampleValue();
                    System.out.println("Temperature is below normal:" + " " + faultyLow);
                }
                else if(samples.get.index().getSampleValue() > faultyHigh) {
                    faultyHigh = samples.get(index).getSampleValue();
                    System.out.println("Temperature is above normal:" + " " + faultyHigh);
                }
            }
        }

    Have problem with populate method. I am getting next mesage: cannot find symbol - constructor sample(java.lang.String)


    I have also another class called Sample:

    /**
     * Write a description of class Sample here.
     * 
     * @author (XXX) 
     * @version (1.0)
     */
    public class Sample
    {
        // representing location and values.
        private String location;
        private int value;
     
        /**
         * Constructor for objects of class Sample
         */
        public Sample(String location, int value)
        {
            this.location = location;
            this.value = value;
        }
     
        public String toString()
        {
            return "[" + location + "]" + " " + value;
        }
    }

    Where I am wrong?


  2. #2
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    Default need help with my code

    Here is the code:


    import java.util.ArrayList;
    /**
     * A class to model an Analyser
     * 
     * @author (XXXX) 
     * @version (1.0)
     */
    public class Analyser
    {
        // instance variables - replace the example below with your own
        public ArrayList<Sample> samples;
     
        /**
         * Constructor for objects of class Analyser
         */
        public Analyser()
        {
            // initialise instance variables
           samples = new ArrayList<Sample>();
        }
     
        /**
         * An example of a method - replace this comment with your own
         */
        public void addSample(String location, int value)
        {
            if(value >= 0) {
                samples.add(new Sample(location, value));
            }
            else {
                System.out.println("The temperature is lower than absolute zero" + "\n" + "Temperature must be zero or greater");
            }
        }
     
        public void populate()
       {
           samples = new ArrayList<Sample>();
           samples.add(new Sample("Meston" + " " + 284));
           samples.add(new Sample("Fraser Noble" + " " + 274));
           samples.add(new Sample("Edward Wright" + " " + 309));
           samples.add(new Sample("New Kings" + " " + 260));
           samples.add(new Sample("Kings College" + " " + 265));
        }
     
        public void showSamples()
        {
            int index = 0;
            while(index < samples.size()) {
                System.out.println(samples.get(index));
                index++;
            }
        }
     
        public int highestTempRecorded()
        {
            int highest = 0;
            for(int index = 0; index < samples.size(); index++) {
                if(samples.get(index).getSampleValue() > highest)
                highest = samples.get(index).getSampleValue();
            }
            System.out.println("The highest temperature recorded is:" + " " + highest);
        }
     
        public void showFaultySensors()
        {
            int faultyLow = 260;
            int faultyHigh = 309;
            for(int index = 0; index < sample.size(); index++)
                if(samples.get.index().getSampleValue() < faultyLow) {
                    faultyLow = samples.get(index).getSampleValue();
                    System.out.println("Temperature is below normal:" + " " + faultyLow);
                }
                else if(samples.get.index().getSampleValue() > faultyHigh) {
                    faultyHigh = samples.get(index).getSampleValue();
                    System.out.println("Temperature is above normal:" + " " + faultyHigh);
                }
            }
        }
    Have problem with populate method. I am getting next mesage: cannot find symbol - constructor sample(java.lang.String)


    I have also another class called Sample:



    /**
     * Write a description of class Sample here.
     * 
     * @author (XXX) 
     * @version (1.0)
     */
    public class Sample
    {
        // representing location and values.
        private String location;
        private int value;
     
        /**
         * Constructor for objects of class Sample
         */
        public Sample(String location, int value)
        {
            this.location = location;
            this.value = value;
        }
     
        public String toString()
        {
            return "[" + location + "]" + " " + value;
        }
    }

  3. #3
    Administrator copeg's Avatar
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    Default Re: need help with my code

    The code to create the Sample objects trying to use a constructor that accepts a single string, however the Sample class defines its constructor to accept a String and an int, perhaps you were trying to do the following:
    new Sample("Meston", 284)

  4. #4
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    Default Re: need help with my code

    solved, thanks!

    next error appearing here
     public int highestTempRecorded()
        {
            int highest = 0;
            for(int index = 0; index < samples.size(); index++) {
               [B] if(samples.get(index).getSampleValue() > highest)[/B]
                highest = samples.get(index).getSampleValue();
            }
            System.out.println("The highest temperature recorded is:" + " " + highest);
        }
    Last edited by helloworld922; December 5th, 2010 at 05:13 PM.

  5. #5
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    Default Re: Need help, cannot find error

    I Think its this:

    samples.add(new Sample("Kings College" + " " + 265));
    You're treating the input as one String.

    try

    samples.add(new Sample("Kings College",265));

    that goes for all similar lines.

  6. The Following User Says Thank You to newbie For This Useful Post:

    Imeri0n (December 5th, 2010)

  7. #6
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    Default Re: Need help, cannot find error

    Thanks, this problem is solved!)

    I got next error here:

     public int highestTempRecorded()
        {
            int highest = 0;
            for(int index = 0; index < samples.size(); index++) {
                [B]if(samples.get(index).getSampleValue() > highest)[/B]
                highest = samples.get(index).getSampleValue();
            }
            System.out.println("The highest temperature recorded is:" + " " + highest);
        }

    Dunno what is wrong (

  8. #7
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    Default Re: Need help, cannot find error

    Post your exception error message

  9. #8
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    Default Re: Need help, cannot find error

    cannot find symbol - method getSampleValue()

  10. #9
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    Default Re: Need help, cannot find error

    you havent got a getSampleValue() method anywhere in your classes.

    Either create one or seek an alternative way of doing what you need.

  11. #10
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    Default Re: Need help, cannot find error

    made it like this:

    public int highestTempRecorded()
    {
    int highestTemp = samples[0];
    int highestTempRecorded = 0;
    for(int index = 1; index < samples.length; index++) {
    if(highestTempRecorded < samples[index]) {
    highestTempRecorded = samples[index];
    highestTempRecorded = index;
    }
    }
    }

    got such a message: array required, but java.util.ArrayList<Sample> found

  12. #11
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    Default Re: Need help, cannot find error

    Any ideas how to solve problem?

  13. #12
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    Default Re: Need help, cannot find error

    Array[] and ArrayList are two different things

  14. #13
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    Default Re: need help with my code

    Your Sample class doesn't have the method getSampleValue() (at least not as far as I can tell).

    You need to explicitly declare this method and define it.

  15. #14
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    Default Re: Need help, cannot find error

    In the future, please don't ask the same question in multiple topics. I've merged the two.

    Also, please use highlight or code tags with your code.

    [code]your code goes here[/code]
    looks like:
    //your code goes here

    [highlight=Java]//your code goes here[/highlight]

    looks like:
    //your code goes here

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