[Posiedon]

Hello guys.I built a quiz game where the user can enter a set of question,save it to disk and reload it to play the game (Got the qt in Head First Java,they have given the code but i did the entire code myself to learn and practice).I am done with the entire code but having just 1 problem.In the 'playFrame' window i am trying to put the textArea and show the question in that space and if the user clicks 'Show Answer' it would show the answer in the same window.But i dont understand what i am doing wrong as i am not able to see any text in the textArea.I tried everything like putting textArea in the frame(through scroller) and also putting the textarea on a panel and then adding the panel on the frame.Still it doesnt work.

I have put the System.out.println statements so you can see that i am displaying the correct question and corresponding answer.But please let me know how do i add it in the textArea.It is in the Play class.

Here is the entire code.Do let me know if any part of code is unclear.

import java.awt.*;
import java.awt.event.*;
import java.io.*;

import javax.swing.*;


import java.util.*;

public class QuizCardBuilder 
{
	int z=-1;
	
	ArrayList<QuizCard> list = new ArrayList<QuizCard>();
	
	JTextArea question = new JTextArea(8,20);
	JTextArea answer = new JTextArea(8,20);
	
	JFrame fqcb = new JFrame("Quiz Card Builder");
	
/*	public static void main(String args[])
	{
	QuizCardBuilder qcb = new QuizCardBuilder();
	qcb.go();
	}                          //  */
	public void go()
	{

		JPanel panel = new JPanel();
	    JPanel panel2 = new JPanel();
	    		
		fqcb.setSize(400, 400);	
			
		JScrollPane qscroll = new JScrollPane(question);		
		JScrollPane ascroll = new JScrollPane(answer);	
		
		question.setLineWrap(true);
		answer.setLineWrap(true);
		
		qscroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		qscroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		ascroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		ascroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		
		panel.add(qscroll);
		panel2.add(ascroll);
		fqcb.getContentPane().add(BorderLayout.NORTH,panel);
		fqcb.getContentPane().add(BorderLayout.CENTER,panel2);
		fqcb.add(panel2);
		fqcb.setVisible(true);
	
		JPanel southpanel = new JPanel();
		
		JButton nextCard = new JButton("NEXT CARD");
		JButton done = new JButton("DONE");
		
		southpanel.add(nextCard);
		southpanel.add(done);
		fqcb.add(BorderLayout.SOUTH,southpanel);
		
		fqcb.setDefaultCloseOperation(fqcb.EXIT_ON_CLOSE);
		
		nextCard.addActionListener(new NextCardAction());
		done.addActionListener(new DoneAction());
		}
	class NextCardAction implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
		{
			String a=question.getText();
			String b=answer.getText();
			z++;
			QuizCard card = new QuizCard(z,a,B)/>;
			list.add(card);
			question.setText(null);
			answer.setText(null);
		}
	}
	class DoneAction implements ActionListener
	{
		public void actionPerformed (ActionEvent event)
		{
			String a=question.getText();
			String b=answer.getText();
			z++;
			QuizCard card = new QuizCard(z,a,B)/>;
			list.add(card);
			try
			{
				FileOutputStream fs = new FileOutputStream(new File("CardSet.ser"));
				ObjectOutputStream os = new ObjectOutputStream(fs);
			//	System.out.println(list);
				os.writeObject(list);
				os.close();
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
			
			
			fqcb.dispose();
		}
	}
	
	
}

import java.awt.*;
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
public class QuizCardPlayer
{
	 QuizCard qc = new QuizCard();
	 Play p = new Play();
	public class CardSetListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
		{
			QuizCardBuilder qcb = new QuizCardBuilder();
			qcb.go();
			
		}
	}
	public class StartGameListener implements ActionListener
	{
		public void actionPerformed (ActionEvent event)
		{
		    qc.qt_no=0;
			p.q=qc.qt_no;
			Play play = new Play();
			play.go();
		}
	}
	public static void main(String args[])
	{
		QuizCardPlayer qcp = new QuizCardPlayer();
		qcp.go();
	}     
	public void go()
	{
		JFrame frame = new JFrame("Quiz Game");
		frame.setSize(400, 400);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		
		JMenuBar menuBar = new JMenuBar();
		JMenu menu = new JMenu("File");
		
		JMenuItem menuItem1 = new JMenuItem("Create card set");
		JMenuItem menuItem2 = new JMenuItem("Start Game");
		
		frame.add(BorderLayout.NORTH,menuBar);
		
		menuBar.add(menu);
		
		menu.add(menuItem1);
		menu.add(menuItem2);
		
		menuItem1.addActionListener(new CardSetListener());
		menuItem2.addActionListener(new StartGameListener());
	}
	
}

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.util.ArrayList;

import javax.swing.*;

public class Play 
{
	ArrayList<QuizCard> list2 = new ArrayList<QuizCard>();
	
	JFrame playFrame = new JFrame("PLAY");
	JTextArea textArea = new JTextArea("Text Area",5,10);
	
	
	int q;
	//QuizCardBuilder qcb = new QuizCardBuilder();
	public class NextQuestionListener implements ActionListener
	{
		
		public void actionPerformed(ActionEvent event)
		{
			
			if(q==0)
			{
				QuizCard temp = new QuizCard();		    
				temp =list2.get(q);
				System.out.println(temp.qt);
				textArea.setText(temp.qt);
				
				
			}
			else if(q>=list2.size())
			{
				textArea.setText("Questions over");
				System.out.println("Questions over");
			}     
			else
			{
				
				QuizCard temp = new QuizCard();
				temp =list2.get(q);
				textArea.setText(temp.qt);
				System.out.println(temp.qt);
			}
			
			q++;
		}
		
		
	}
	public class ShowAnswerListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
		{
			q--;
			QuizCard temp = new QuizCard();
			temp =list2.get(q);
			textArea.setText(temp.ans);
			System.out.println(temp.ans);
			q++;
		}
	}
/*	public static void main(String args[])
	{
		Play play = new Play();
		play.go();
	}     */
	public void go()
	{
		try
		{
		FileInputStream fs = new FileInputStream("CardSet.ser");
		ObjectInputStream os = new ObjectInputStream(fs);
		Object one = os.readObject();
		
		list2 = (ArrayList<QuizCard>) one;
	//	System.out.println(list2.size());
		}
		catch(Exception ex)
		{
			ex.printStackTrace();
		}    
		
		
		
		playFrame.setSize(400, 400);
		playFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		playFrame.setVisible(true);
		
		
		JPanel southPanel = new JPanel();
			
		JScrollPane textAreaScroller = new JScrollPane();
		textAreaScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		textAreaScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		
		JButton nextQuestion = new JButton("Next Question");
		JButton showAnswer = new JButton("Show Answer");
		
		textArea.setLineWrap(true);
		
		southPanel.add(nextQuestion);
		southPanel.add(showAnswer);
		playFrame.add(BorderLayout.SOUTH,southPanel);

		textArea.setSize(20,20);
		
		JPanel panel2= new JPanel();
		panel2.add(textAreaScroller);
		playFrame.getContentPane().add(BorderLayout.CENTER,textAreaScroller);
	//	playFrame.add(BorderLayout.NORTH,panel2);
		
		textAreaScroller.setVisible(true);
		textArea.setVisible(true);
		
		nextQuestion.addActionListener(new NextQuestionListener());
		showAnswer.addActionListener(new ShowAnswerListener());
		
	}
	
}

import java.io.*;


public class QuizCard implements Serializable
{
  //  static int counter=0;
	int qt_no;
	String qt;
    String ans;
    QuizCard()
    {
    	
    }
    QuizCard(int q,String a,String B)/>
    {
    	qt_no=q;
    	qt=a;
    	ans=b;
    }
	
}

Thanks in advance.

[g00se]

Quote

    fqcb.add(panel2);

Try getting rid of the above

[Posiedon]

tried that..still the same problem.

[shadowhunterO]

First, I would try cleaning up you're code so It's easier to read

[g00se]

You've commented out the main method that you should be starting the app from

[pbl]

Where is your main() ?

[Posiedon]

main() in is QuizCardPlayer class.

[Posiedon]

Sorry guys i understand the program is messed up as i did a lot of trial and error doing it and its my first attempt at writing a program of this size.I hope the below one makes it easier to read.

First the QuizCard class: This is for storing the question no,question and its answer.

import java.io.*;


public class QuizCard implements Serializable
{
 
	int qt_no;
	String qt;
    String ans;
    QuizCard()         //i wanted to create a QuizCard object without any arguments
    				//but i already have a constructor so i just created this blank constructor
    {
    	
    }
    QuizCard(int q,String a,String B)/>
    {
    	qt_no=q;
    	qt=a;
    	ans=b;
    }
	
}

QuizCardBuilder class:This is for the user to create a set of questions and store them so that he ca use them to play with.

import java.awt.*;
import java.awt.event.*;
import java.io.*;

import javax.swing.*;


import java.util.*;

public class QuizCardBuilder 
{
	int z=-1;       
	
	ArrayList<QuizCard> list = new ArrayList<QuizCard>();    //list to store all questions and answers
	
	JTextArea question = new JTextArea(8,20);
	JTextArea answer = new JTextArea(8,20);
	
	JFrame fqcb = new JFrame("Quiz Card Builder");   //fqcb is frame quizcardbuilder
	
	public void go()       //this method creates a frame that takes the input of questions and answers
	{

		JPanel panel = new JPanel();
	    JPanel panel2 = new JPanel();
	    		
		fqcb.setSize(400, 400);	
			
		JScrollPane qscroll = new JScrollPane(question);		
		JScrollPane ascroll = new JScrollPane(answer);	
		
		question.setLineWrap(true);
		answer.setLineWrap(true);
		
		qscroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		qscroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		ascroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		ascroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		
		panel.add(qscroll);
		panel2.add(ascroll);
		fqcb.getContentPane().add(BorderLayout.NORTH,panel);
		fqcb.getContentPane().add(BorderLayout.CENTER,panel2);
	
		fqcb.setVisible(true);
	
		JPanel southpanel = new JPanel();      //Next card means the user wants to add more cards to the list
											   //Clicking done will close the window
		
		JButton nextCard = new JButton("NEXT CARD");
		JButton done = new JButton("DONE");
		
		southpanel.add(nextCard);
		southpanel.add(done);
		fqcb.add(BorderLayout.SOUTH,southpanel);
		
		fqcb.setDefaultCloseOperation(fqcb.EXIT_ON_CLOSE);
		
		nextCard.addActionListener(new NextCardAction());
		done.addActionListener(new DoneAction());
		}
	class NextCardAction implements ActionListener     //Will store the qt and answer and clear the fields
														//so user can add more data set.
	{ 
		public void actionPerformed(ActionEvent event)
		{
			String a=question.getText();
			String b=answer.getText();
			z++;
			QuizCard card = new QuizCard(z,a,B)/>;
			list.add(card);
			question.setText(null);
			answer.setText(null);
		}
	}
	class DoneAction implements ActionListener    //Will store the qt and answer,save the entire list
												// and then close the window
	{
		public void actionPerformed (ActionEvent event)
		{
			String a=question.getText();
			String b=answer.getText();
			z++;
			QuizCard card = new QuizCard(z,a,B)/>;
			list.add(card);
			try
			{
				FileOutputStream fs = new FileOutputStream(new File("CardSet.ser"));
				ObjectOutputStream os = new ObjectOutputStream(fs);
		
				os.writeObject(list);
				os.close();
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
			
			
			fqcb.dispose();
		}
	}
	
	
}

QuizCardPlayer class:This contains the main() function and will create the frame that has menu with menuItems to start game and a menuitem to create a card set.

import java.awt.*;
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
public class QuizCardPlayer
{
	 QuizCard qc = new QuizCard();
	 Play p = new Play();
	public class CardSetListener implements ActionListener    //When user wants to create a new Card set
	{
		public void actionPerformed(ActionEvent event)
		{
			QuizCardBuilder qcb = new QuizCardBuilder();
			qcb.go();
			
		}
	}
	public class StartGameListener implements ActionListener  //When user wants to play the game
	{
		public void actionPerformed (ActionEvent event)
		{
		    qc.qt_no=0;             //sets question number to 0 so game starts from 1st question
			p.q=qc.qt_no;              //put its value in q (q is in Play class) 
			Play play = new Play();
			play.go();
		}
	}
	public static void main(String args[])
	{
		QuizCardPlayer qcp = new QuizCardPlayer();
		qcp.go();
	}     
	public void go()    //this method creates the frame and add all the menu,menuitem,etc.
	{
		JFrame frame = new JFrame("Quiz Game");
		frame.setSize(400, 400);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		
		JMenuBar menuBar = new JMenuBar();
		JMenu menu = new JMenu("File");
		
		JMenuItem menuItem1 = new JMenuItem("Create card set");
		JMenuItem menuItem2 = new JMenuItem("Start Game");
		
		frame.add(BorderLayout.NORTH,menuBar);
		
		menuBar.add(menu);
		
		menu.add(menuItem1);
		menu.add(menuItem2);
		
		menuItem1.addActionListener(new CardSetListener());
		menuItem2.addActionListener(new StartGameListener());
	}
	
}

Play class:When the user Starts a new game,this class runs.

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.util.ArrayList;

import javax.swing.*;

public class Play 
{
	ArrayList<QuizCard> list2 = new ArrayList<QuizCard>();
	
	JFrame playFrame = new JFrame("PLAY");
	JTextArea textArea = new JTextArea("Text Area",5,10);
	
	int q;      //q here is the question no.In the QuizCardPlayer class i take the qt_no and put its value in q
	
	public class NextQuestionListener implements ActionListener  //Next question on the list is displayed
	{
		
		public void actionPerformed(ActionEvent event)
		{
			
			if(q==0)
			{
				QuizCard temp = new QuizCard();		    
				temp =list2.get(q);
				System.out.println(temp.qt);
				textArea.setText(temp.qt);
				
				
			}
			else if(q>=list2.size())
			{
				textArea.setText("Questions over");
				System.out.println("Questions over");
			}     
			else
			{
				
				QuizCard temp = new QuizCard();
				temp =list2.get(q);
				textArea.setText(temp.qt);
				System.out.println(temp.qt);
			}
			
			q++;
		}
		
		
	}
	public class ShowAnswerListener implements ActionListener    //Will show the answer to the question that is being displayed
																//in the same textArea
	{
		public void actionPerformed(ActionEvent event)
		{
			q--;
			QuizCard temp = new QuizCard();
			temp =list2.get(q);
			textArea.setText(temp.ans);
			System.out.println(temp.ans);
			q++;
		}
	}

	public void go()
	{
		try                //loads the saved question set
		{
		FileInputStream fs = new FileInputStream("CardSet.ser");
		ObjectInputStream os = new ObjectInputStream(fs);
		Object one = os.readObject();
		
		list2 = (ArrayList<QuizCard>) one;
	
		}
		catch(Exception ex)
		{
			ex.printStackTrace();
		}    
		
		
								//below is the code where i am unable to display the JTextArea
		playFrame.setSize(400, 400);
		playFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		playFrame.setVisible(true);
		
		
		JPanel southPanel = new JPanel();
			
		JScrollPane textAreaScroller = new JScrollPane();
		textAreaScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		textAreaScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		
		JButton nextQuestion = new JButton("Next Question");
		JButton showAnswer = new JButton("Show Answer");
		
		textArea.setLineWrap(true);
		
		southPanel.add(nextQuestion);
		southPanel.add(showAnswer);
		playFrame.add(BorderLayout.SOUTH,southPanel);

		textArea.setSize(20,20);
		
		JPanel panel2= new JPanel();
		panel2.add(textAreaScroller);
		playFrame.getContentPane().add(BorderLayout.CENTER,textAreaScroller);
	//	playFrame.add(BorderLayout.NORTH,panel2);
		
		textAreaScroller.setVisible(true);
		textArea.setVisible(true);
		
		nextQuestion.addActionListener(new NextQuestionListener());
		showAnswer.addActionListener(new ShowAnswerListener());
		
	}
	
}

I hope it is easier to read now.Do let me know if anything is still unclear.
Thank You.

[busyme12srv]

Java is case sensitive. You have declared String b as your answer string.


QuizCard card = new QuizCard(z,a,B); // may not work

[Posiedon]

busyme12srv, on 25 June 2012 - 01:28 PM, said:

Java is case sensitive. You have declared String b as your answer string.


QuizCard card = new QuizCard(z,a,B); // may not work

I think i just encountered a bug here.In my program i have used the small letter 'b' everywhere but when i copy-paste the code here and put it in the code tags it turned into capital 'B'.

[g00se]

Quote

I think i just encountered a bug here.In my program i have used the small letter 'b' everywhere but when i copy-paste the code here and put it in the code tags it turned into capital 'B'.

Yes, that's a (long-standing) bug in this site

You need to reinstate the main method you commented out and start the app from that class

[Posiedon]

g00se, on 25 June 2012 - 02:35 PM, said:

Quote

I think i just encountered a bug here.In my program i have used the small letter 'b' everywhere but when i copy-paste the code here and put it in the code tags it turned into capital 'B'.

Yes, that's a (long-standing) bug in this site

You need to reinstate the main method you commented out and start the app from that class

Are you saying i remove the main() in QuizCardPlayer and start from the main() in the Play class???

Because that would just start the game directly without the main window that lets the user add cardset,etc.

I still tried what you said and now the app directly starts the game but still it wont show the textArea.

[g00se]

Quote

I still tried what you said and now the app directly starts the game but still it wont show the textArea.

Then you probably didn't apply what i said in my first comment

[Posiedon]

g00se, on 25 June 2012 - 03:56 PM, said:

Quote

I still tried what you said and now the app directly starts the game but still it wont show the textArea.

Then you probably didn't apply what i said in my first comment

about removing the fqcb.add(panel2) statement right?? I already did that.See its not in the code that i gave the 2nd time.

[g00se]

Please attach code in form of zip file