cant find methods

[andrew cassato]

I have been stuck on this for days! I am trying to call some methods once a button is pressed but i keep getting errors that the methods cant be found, I have tried a lot of different stuff but nothing is working. Here is the main class with the methods as well as the GUI class (where the problem of calling methods from the main class is happening.) and the last one is the Test class to run everything.

import java.util.Scanner;
import javax.swing.*;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class Judging
{
    private int n =0;
    private double[] score = new double[n];
    private double maxScore=0, minScore=11, totalScore=0, finalScore=0;
    private double result =finalScore;
    public Judging(int n)
    {
        score = new double[n];
        this.n = n;
        Scanner console = new Scanner(System.in);
        String answer = "", name="";
    }
    public void setScores(double[] score)
    {
        this.score = score;
    }
    public void inputScores()
    {
        Scanner console = new Scanner(System.in);
        int n=0;
        String name = "", scoresS="";
        double[] score = new double[n];
        for (int i = 0; i < n; i++)
        {
           score[i] = Double.parseDouble(JOptionPane.showInputDialog (null,"enter score "+(i+1)));
           if((score[i]) > 10)
           {
               JOptionPane.showMessageDialog(null,
               "You can't score higher than 10",
               "OOPS!",
               JOptionPane.ERROR_MESSAGE);
               i--;
            }
           else
           {
               i++;
            }
        }
    }
    public void calculateScore()
    {
        int n=8;
        double[] score = new double[n];
        //max score
        for (int i = 0; i < n; i++)
        {
           if (score[i] > maxScore)
           {
              maxScore=score[i];
            }
        }
        //min score
        for (int i = 0; i < n; i++)
        {
           if (score[i] < minScore)
           {
               minScore = score[i];
            }
        }
         //total score
        for (int i = 0; i<n; i++)
        {
            totalScore = (totalScore + score[i]);
        }
        //final score
        finalScore = (totalScore - (minScore+maxScore));
        //Judges calcScore = new Judges(scores);
    }
    public double[] getScores()
    {
        return score;
    }
    public double getResult()
    {
        return result;
    }
}

GUI

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.applet.Applet;

public class JudgingGUI extends JFrame
{
    int n = 8;
    double result = 0;
    private final int APPLET_WIDTH = 450;
    private final int APPLET_HEIGHT = 200;
    private JLabel contestantName,scoreLabel,resultL;
    private JTextField name;
    private JTextField scores[] = new JTextField[n];
    private JLabel judges[] = new JLabel[n];
    private double[] score;
    
    JButton scoreB;
    JButton resetB;
    
    public JudgingGUI(int n)
    {
        setSize(APPLET_WIDTH,APPLET_HEIGHT);
        setLayout(new FlowLayout());
        
        scoreB = new JButton("Compute Score");
        JudgeListener cbHandler;
        cbHandler = new JudgeListener();
        scoreB.addActionListener(cbHandler);
        
        resetB = new JButton("Reset Scores for Next Contestant");
        JudgeListener rbHandler;
        rbHandler = new JudgeListener();
        resetB.addActionListener(rbHandler);
        
        contestantName = new JLabel("Name of contestant");
        scoreLabel = new JLabel("Contestant's score:");
        //resultL = new JLabel(String.parseString(result));
        name = new JTextField(25);
        judges = new JLabel[n];

        add(contestantName);
        add(name);        
        for(int i=0; i<n; ++i)
        {
            judges[i] = new JLabel("Judge "+(i+1));
            add(judges[i]);
            scores[i] = new JTextField(4);
            add(scores[i]);
        } 
        add(scoreB);
        add(scoreLabel);
        add(resultL);
        add(resetB);
    }
    private class JudgeListener implements ActionListener
    {
       public void actionPerformed(ActionEvent e)
       {  
            int n=8;
            double[] score = new double[n];
            Object source = e.getSource();
            
            if(e.getSource()==scoreB)
            {
                System.out.print("WOO"); 
                for(int i=0; i<n; i++)
                {
                    score[i] = Double.parseDouble(scores[i].getText());
                }
                setScores(score);
                //getResult(score);
                Judges.calculateScore(score);
                
            }     
            
            if(e.getSource()==resetB)
            {
                for(int i=0; i<n; i++)
                {
                    score[i]=(0);
                    scores[i].setText("");
                } 
            }
       }
     }
}

Test class

public class TestJudging
{
    public static void main(String[] args)
    {
        int n=8;
        JudgingGUI example = new JudgingGUI(n);
        example.setVisible(true);
    }
}

any help here would be SERIOUSLY appreciated. thanks in advance.

[Maneesh Godbole]

What error are you getting?

[andrew cassato]

cannot find symbol - method setScores(double[])

i used to have Judging.setScores(scores) - which im pretty sure is more accurate - but i kept trying more and more random stuff out of frustration.

[Maneesh Godbole]

Your method setScores(double[] score) belongs to the Judging class. You are trying to invoke it from the JudgingGUI class.

Hint: Can you invoke a method without having a reference to the object which is the owner of the method?

Imagine a User class with a method getMailID() which returns the mail ID of that user.
Now imagine two users Andrew and Maneesh
Now imagine some class invoking the method getMailID() like the way you have coded.
Would the JVM know whose mail ID you are asking for? Andrew's or Maneesh's?

[andrew cassato]

so you are saying it would need to be something like

Judging.setScores(scores);

?

[buntha Choudhary]

andrew cassato wrote:so you are saying it would need to be something like

Judging.setScores(scores);

?

Then you will have to make your method static in the class. You can try the same by creating any instance of the Judging class and use that

[Maneesh Godbole]

No. What you have there is a static method
What you need to do is obtain an instance of the Judging class and then invoke the setScores on it.

Judging judge=new Judging();
judge.setScore(scores);

Just remember, whenever you invoke setScores() you would want to invoke it on the same instance. So it the judge should be stored as a class variable in your JudgingGUI

[andrew cassato]

Maneesh Godbole wrote:No. What you have there is a static method
What you need to do is obtain an instance of the Judging class and then invoke the setScores on it.

Judging judge=new Judging();
judge.setScore(scores);

Just remember, whenever you invoke setScores() you would want to invoke it on the same instance. So it the judge should be stored as a class variable in your JudgingGUI

this is obviously not that clear to me, I'm not 100% sure where to put
Judging judge=new Judging();
I tried a couple places but i get an error "cannot find symbol - variable judge" in the same place where i was getting errors before

[buntha Choudhary]

andrew cassato wrote:

Maneesh Godbole wrote:No. What you have there is a static method
What you need to do is obtain an instance of the Judging class and then invoke the setScores on it.

Judging judge=new Judging();
judge.setScore(scores);

Just remember, whenever you invoke setScores() you would want to invoke it on the same instance. So it the judge should be stored as a class variable in your JudgingGUI

this is obviously not that clear to me, I'm not 100% sure where to put
Judging judge=new Judging();
I tried a couple places but i get an error "cannot find symbol - variable judge" in the same place where i was getting errors before

Sample -

   int n = 8;
    double result = 0;
    private final int APPLET_WIDTH = 450;
    private final int APPLET_HEIGHT = 200;
    private JLabel contestantName,scoreLabel,resultL;
    private JTextField name;
    private JTextField scores[] = new JTextField[n];
    private JLabel judges[] = new JLabel[n];
    private double[] score;
    
    JButton scoreB;
    JButton resetB;
   Judging judge = new Judging(9);

[andrew cassato]

thanks that did the trick, now to solving the rest!

thanks.