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GUI not updating (repainting)

January 21, 2013, 7:44 pm
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I'm having trouble with the GUI updating after I run the applet. I've tried different methods such as repaint() and revalidate() and am not sure if I'm doing it wrong or I'm missing something. Currently I have working to the point where the applet gets "painted" only once.

This applet is a math quiz game in which there is a math questions and the player has to answer it. If they get it right they gain 50 points but if they get it wrong they lose 100 points.

Since I can't get the questions or score to update on the applet itself, I just have them printed on to the console. You still have to type the answer in the TextField of the applet though.

Keep in mind that I am a novice programmer so the code may be messy. Thanks in advance!

import java.applet.Applet;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.util.Random;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JOptionPane;
import javax.swing.JTextArea;
/*
 * A simple math quiz that lets you test your math skills.
 */
public class NewIdeaMath extends Applet
{
    int elo = 100;
    int input;
    String question = " ";
    Color black = new Color(255, 255, 255);
    Color white = new Color(0, 0, 0);
    int x = 0, y = 0, z = 0; 
    int ans = 0;
    
    boolean ready = true;
    Font f = new Font("Dialog", Font.PLAIN, 50);
    Font g = new Font("Dialog", Font.PLAIN, 30);
    
    protected TextField userInput;
    protected TextField scoreField;
    protected TextField questionField;
    protected JTextArea textArea;
    //Creating stuff

    public void init ()
    {       
        ask();

    }
    public void ask()
    {          
         getELO();
			repaint();
         System.out.println(question);
         userInput = new TextField(50);
         scoreField = new TextField(9);
         questionField = new TextField(20);
         scoreField.setEditable(true);
         questionField.setEditable(true);
         scoreField.setFont(g);
         questionField.setFont(f);
         Button b = new Button("Check Answer");
         this.add(questionField);
         this.add(scoreField);
         this.add(userInput);
         this.add(B)/>/>;
         questionField.setText(question);
         scoreField.setText("Points: "+elo);
         AreTheyReady atr = new AreTheyReady(userInput, elo, ans, ready);
         b.addActionListener(atr);
         input = atr.parsedAnswer;
         //checkAnswer();
         ready = false;
         elo = atr.elo;
           
    }
    public void paint(Graphics p)
    {
        setSize(1000, 200);
        p.fillRect(0, 0, 1000, 800);
        p.setFont(f);
        p.setColor(Color.gray);
        //Sets the size of the canvas.

        p.drawLine(0, 700, 1000, 700);
        p.drawString("You have "+"    points.", 25, 780);
        //Drawing Scoreboard

        p.setColor(Color.white);
        p.drawString(question, 200, 400);
        
    }
    public void getELO()
    {
        //---------0 - 950 ELO--------------------------------------------------------------------
        if (elo <= 0)
        {
            System.out.println("You lose.");
            System.exit(0);
        }
        if (elo == 50)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is " + x + " + 0?";
            ans = x;
        }   

        if (elo == 100 || elo == 150)
        {           
				int n [] = {1,2};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is " + x + " + " + y + "?";
            ans = x + y; 
          
        }

        if (elo == 200 || elo == 250)
        {
            int n [] = {1,2,3,4,5,6};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is " + x + " + " + y + "?";
            ans = x + y;
            
        }   

        if (elo == 300 || elo == 350)
        {
            int n [] = {1,2,3};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is " + x + " - " + y + "?";
            ans = x - y;
        }
        if (elo == 400 || elo == 450)
        {
            int n [] = {1,2,3,4,-5,-6,-7};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is " + x + " + " + y + "?";
            ans = x + y;
        }
        if (elo == 500 || elo == 550)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is sum of " + x + " and " + y + " multiplied by 2?";
            ans = (x + y) * 2;
        }
        if (elo == 600 || elo == 650)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is the sum of " + x + " and " + y + " multiplied by 3?";
            ans = (x + y) * 3;
        }   
        if (elo == 700 || elo == 750)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is 2 * " + x + " + " + y + "?\n Remember order of operations!";
            ans = x + x + y;
        }
        if (elo == 800 || elo == 850)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            question = "What is 2 * " + x + " + 2 * " + y + "?\n Remember order of operations!";
            ans = x + x + y + y;
        }
        if (elo == 900 || elo == 950)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]); 
            question = "What is " + x + " + " + y + " + " + z + "?";
            ans = x + y + z;
        }       
        //---1000+ ELO--------------------------------------------------------------------------
        if (elo == 1000 || elo == 1050)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is (" + x + " - " + y + " - " + z + ") * 3?";
            ans = (x - y - z) * 3;
        }
        if (elo == 1100 || elo == 1150)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]); 
            question = "What is (" + x + " * " + y + ") + (" + y + " * " + z + ")?";
            ans = (x * y) + (y * z);
        }
        if (elo == 1200 || elo == 1250)
        {
            int n [] = {1,2,3,4,5,6,7,8,9};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]); 
            question = "What is (" + x + " * " + y + ") - (" + y + " * " + z + ")?";
            ans = (x * y) - (y * z);
        }
        if (elo == 1300 || elo == 1350)
        {
            int n [] = {11,16,21,22,33,44,46,54,55,66,77,88,99};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is " + x + " + " + y + "?"; 
            ans = x + y;
        }
        if (elo == 1400 || elo == 1450)
        {
            int n [] = {13,16,21,22,33,44,46,54,55,66,77,88,99};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is " + x + " - " + y + "?";  
            ans = x - y;
        }               
        if (elo == 1500 || elo == 1550)
        {
            int n [] = {3,5,7,9,11,20,30,91};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is " + x + " * " + y + "?";  
            ans = x * y;
        }
        if (elo == 1600 || elo == 1650)
        {
            int n [] = {11,16,21,22,33,44,46,54,55,66,77,88,99};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is " + x + " + " + y + " + " + z + "?"; 
            ans = x + y + z;
        }
        if (elo == 1700 || elo == 1700)
        {
            int n [] = {9,12,15,17,30,40,50,60,70,80,90};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]); 
            question = "What is 5 * " + x + " + 5 * " + y + "?\n Remember order of operations!";
            ans = x + x + x + x + x + y + y + y + y + y; //5x + 5y
        }
        if (elo == 1800 || elo == 1800)
        {
            int n [] = {7,9,5,4,20,50,30,21,100};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is 5 * " + x + " + 5 * " + y + " - 5 * " + z + "?\n Remember order of operations!"; 
            ans = x + x + x + x + x + y + y + y + y + y - z - z - z - z - z; //5x + 5y - 5z
        }
        if (elo == 1900 || elo == 1950)
        {
            int n [] = {11,16,21,22,33,44,46,54,55,66,77,88,99};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]);
            question = "What is " + x + " * " + y + "?"; 
            ans = x * y;
        }
        if (elo == 2000)
        {
            int n [] = {11,16,21,22,33,44,46,54,55,66,77,88,99};
            Random random = new Random();
            x = (n[random.nextInt(n.length)]);
            y = (n[random.nextInt(n.length)]);
            z = (n[random.nextInt(n.length)]); 
            question = "What is (" + x + " * " + y + " * " + z + ") + (" + x + " + " + y + " + " + z + ")?";
            ans = (x * y * z) + (x + y + z);
        }
		System.out.println("X: " + x + " | Y: " + y + " | Answer: " + ans);  
    }
}

class AreTheyReady implements ActionListener
{   
    private TextField userInput;
    int elo;
    int ans;
    int parsedAnswer;
	 int run = 1;
    boolean ready;
    public NewIdeaMath a = new NewIdeaMath();
    public AreTheyReady(TextField userInput, int elo, int ans, boolean ready)
    {
        this.userInput = userInput;
        this.elo = elo;
        this.ans = ans;
        this.ready = ready;
    }
    public void actionPerformed(ActionEvent ae)
    {
        String answerEntered = userInput.getText();
        try
        {
            parsedAnswer = Integer.parseInt(answerEntered);
				//System.out.println("Parsed: " + parsedAnswer);
				//System.out.println("ans: " + ans);
        }
        catch(NumberFormatException e)
        {
            System.out.println("That isn't a number silly!");
        }     
        returnScore();
        returnReady();
        System.out.println("ELO: " + elo);
        //System.out.println("Answer: " + a.ans);
        userInput.setText("");
        a.elo = elo;
        a.ask();
        a.questionField.setText(a.question);
        a.scoreField.setText(""+a.elo);
        
    }
    public boolean returnReady()
    {
        //a.getELO();
        a.revalidate();
        ready = true;
        return ready;
    }
    public int returnScore()
    {
		 if (run == 1)
		 {    
			  if (parsedAnswer == ans)
	        {
	            elo += 50;
	            System.out.println("You are correct.");
	        }
	        else
	        {
	            elo -= 100;
	        System.out.println("You are wrong.");
	        }
			  run = run + 1;
	        return elo;
		}
		else
		{
			  if (parsedAnswer == a.ans)
	        {
	            elo += 50;
	            System.out.println("You are correct.");
	        }
	        else
	        {
	            elo -= 100;
	        System.out.println("You are wrong.");
	        }
	        return elo;
		}
   }

}
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