Thread: 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?

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;
    }
}

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)

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.

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 (

Post your exception error message

cannot find symbol - method getSampleValue()

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

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

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

Any ideas how to solve problem?

Array[] and ArrayList are two different things