Having problem displaying JTable

[rmartinsaraujo]

Hi, I'm still getting used to Swing components, and I'm having trouble creating a JTable that receives values during the execution of my program and displays it. Apparently it works fine when I try to create the table in the Main function, but when I try to do it in the middle of another function it displays a frame with nothing inside.
this is my code for creating and displaying a Table (it's a modified sun example).

public class Tabela extends JPanel {

    public Tabela(String[] columnNames, Object[][] data) {
        super(new GridLayout(1,0));

        final JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);


        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.
        add(scrollPane);
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    protected static void createAndShowGUI(String[] columnNames, Object[][] data) {
        //Create and set up the window.
        JFrame frame = new JFrame("Tabela");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        Tabela newContentPane = new Tabela(columnNames, data);
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
}

This is the main class of the program, sorry for posting so much code but I have no idea why this problem is happening.

/* Defines the system's interface */
public class Repart implements ActionListener{

	private JButton go;
    private JTextField nuConsumers;
	private JTextField percCons;
	private JTextField percBold;
	private JTextField percMiser;
    private JTextField nuEnterprises;
    private JTextField percInvestor;
    private JTextField percDecadent;
    private JTextField percCheater;
    private JTextField percGreedy;
    private JTextField percStrategist;
    private JTextField percWholesaler;
    private JTextField percReactive;
	private JTextField timewhen;
	private JRadioButton enabled;
	private JRadioButton disabled;
	private JRadioButton trueRumour;
    private JRadioButton falseRumour;
    private JRadioButton positive;
    private JRadioButton negative;
	private ButtonGroup group;
    private ButtonGroup group2;
    private ButtonGroup group3;
	private JSpinner timesteps;
	private final SpinnerModel sm;
    private JSpinner percConsumers;
    private final SpinnerModel sm2;

    /* Simulation Options*/

    private int cycles;

    private int numConsumers;
    private int pConservative, pBold, pMiser;


    private int numEnterprises;
    private int pInvestor, pDecadent, pCheater, pGreedy, pStrategist, pWholesaler, pReactive;

    private boolean enableRumour, isTrue, isPositive;
    private int when;
    private int pConsumers;


	public Repart(){
		sm = new SpinnerNumberModel(new Integer(0), new Integer(0), new Integer(1000), new Integer(10));
        sm2 = new SpinnerNumberModel(new Integer(0), new Integer(0), new Integer(100), new Integer(5));
		timesteps = new JSpinner(sm);
        percConsumers = new JSpinner(sm2);
        nuConsumers = new JTextField(5);
		percCons = new JTextField(3);
		percBold = new JTextField(3);
        percMiser = new JTextField(3);
        nuEnterprises = new JTextField(5);
        percInvestor = new JTextField(3);
        percDecadent = new JTextField(3);
        percCheater = new JTextField(3);
        percGreedy = new JTextField(3);
        percStrategist = new JTextField(3);
        percWholesaler = new JTextField(3);
        percReactive = new JTextField(3);

        timewhen = new JTextField(6);
		group = new ButtonGroup();
        group2 = new ButtonGroup();
        group3 = new ButtonGroup();
		go = new JButton("Go");
	}

	public void launchFrame(){
		JFrame frame = new JFrame("RePart");
		frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		frame.setLocation(300, 50);

		frame.setLayout(new GridLayout(17,1));
		
		FlowLayout fl = new FlowLayout(FlowLayout.LEFT);

		Panel p = new Panel();
		JLabel time = new JLabel("Cycles:");
		p.setLayout(fl);
		p.add(time);
		timesteps.addChangeListener(new ChangeListener(){
			public void stateChanged(ChangeEvent e){
				String text = timesteps.getValue().toString();
				cycles = Integer.parseInt(text);
			}
		});
		p.add(timesteps);
		frame.add(p);

        JSeparator sep = new JSeparator();
        frame.add(sep);

        Panel p0 = new Panel();
        p0.setLayout(fl);
        JLabel labelNumConsumers = new JLabel("Number of Consumers:");
        p0.add(labelNumConsumers);
        p0.add(nuConsumers);
        frame.add(p0);

		Panel p1 = new Panel();
		p1.setLayout(fl);
		JLabel cons = new JLabel("Conservative :");
		JLabel bold = new JLabel("  Bold :");
		JLabel miser = new JLabel("  Miser :");
		JLabel percentage1 = new JLabel("%");
		JLabel percentage2 = new JLabel("%");
		JLabel percentage3 = new JLabel("%");
	
		p1.add(cons);
		p1.add(percCons);
		p1.add(percentage1);
		
		p1.add(bold);
		p1.add(percBold);
		p1.add(percentage2);
		
		p1.add(miser);
		p1.add(percMiser);
		p1.add(percentage3);

		frame.add(p1);

        JSeparator sep2 = new JSeparator();
        frame.add(sep2);


        Panel p2 = new Panel();
        p2.setLayout(fl);
        JLabel labelNumEnterprises = new JLabel("Number of Enterprises:");
        p2.add(labelNumEnterprises);
        p2.add(nuEnterprises);
        frame.add(p2);



		Panel p3 = new Panel();
		p3.setLayout(fl);
		JLabel inv = new JLabel("   Investor :");
		JLabel ins = new JLabel("  Decadent :");
		JLabel chea = new JLabel("    Cheater :   ");

		JLabel percentage4 = new JLabel("%");
		JLabel percentage5 = new JLabel("%");
		JLabel percentage6 = new JLabel("%");

		p3.add(inv);
		p3.add(percInvestor);
		p3.add(percentage4);
		
		p3.add(ins);
		p3.add(percDecadent);
		p3.add(percentage5);
		
		p3.add(chea);
		p3.add(percCheater);	
		p3.add(percentage6);
        frame.add(p3);


        Panel p4 = new Panel();
        p4.setLayout(fl);

        JLabel gree = new JLabel("   Greedy :  ");
        JLabel str = new JLabel("  Strategist :");
        JLabel ws = new JLabel("  Wholesaler :");

	    JLabel percentage7 = new JLabel("%");
        JLabel percentage8 = new JLabel("%");
        JLabel percentage9 = new JLabel("%");

	    p4.add(gree);
        p4.add(percGreedy);
        p4.add(percentage7);

        p4.add(str);
        p4.add(percStrategist);
        p4.add(percentage8);

        p4.add(ws);
        p4.add(percWholesaler);
        p4.add(percentage9);
        frame.add(p4);

        Panel p5 = new Panel();
        p5.setLayout(fl);

		JLabel reac = new JLabel("   Reactive :");

        JLabel percentage10 = new JLabel("%");

        p5.add(reac);
		p5.add(percReactive);
		p5.add(percentage10);
        frame.add(p5);

        JSeparator sep3 = new JSeparator();
        frame.add(sep3);


		Panel p6 = new Panel();
		p6.setLayout(fl);
		JLabel publicity = new JLabel("Rumour:");
    	p6.add(publicity);

        enabled = new JRadioButton("Enable   ", true);
        disabled = new JRadioButton("Disable", false);
        group.add(enabled);
        group.add(disabled);

		p6.add(enabled);
		p6.add(disabled);

        frame.add(p6);

        Panel p7 = new Panel();
        p7.setLayout(fl);

        JLabel space = new JLabel("             ");
        trueRumour = new JRadioButton("True      ", true);
        falseRumour = new JRadioButton("False", false);
        group2.add(trueRumour);
        group2.add(falseRumour);

        p7.add(space);
        p7.add(trueRumour);
        p7.add(falseRumour);

        frame.add(p7);
    
        Panel p8 = new Panel();
        p8.setLayout(fl);

        JLabel space2 = new JLabel("             ");
        positive = new JRadioButton("Positive ", true);
        negative = new JRadioButton("Negative", false);
        group3.add(positive);
        group3.add(negative);

        p8.add(space2);
        p8.add(positive);
        p8.add(negative);

        frame.add(p8);

        Panel p9 = new Panel();
        p9.setLayout(fl);

		JLabel w = new JLabel("When?");
		p9.add(w);
		p9.add(timewhen);
	 
        
        JLabel pC = new JLabel("      Percentage of Consumers: ");
        p9.add(pC);
		percConsumers.addChangeListener(new ChangeListener(){
			public void stateChanged(ChangeEvent e){
				String text = percConsumers.getValue().toString();
				pConsumers = Integer.parseInt(text);
			}
		});
        p9.add(percConsumers);


        frame.add(p9);

        JSeparator sep4 = new JSeparator();
        frame.add(sep4);

		Panel p10 = new Panel();
        go.addActionListener(this);
        p10.add(go);
		frame.add(p10);

		frame.pack();
		frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent e){
		boolean isOk = true;
		SimulatorCore sm = new SimulatorCore();

        String text = nuConsumers.getText();
		if(text.length() == 0)
			numConsumers = 0;
		else
        	numConsumers = Integer.parseInt(text);

        text = percCons.getText();
		if(text.length() == 0)
			pConservative = 0;
		else
        	pConservative = Integer.parseInt(text);

        text = percBold.getText();
		if(text.length() == 0)
			pBold = 0;
		else
        	pBold = Integer.parseInt(text);

        text = percMiser.getText();
		if(text.length() == 0)
			pMiser = 0;
		else
        	pMiser = Integer.parseInt(text);

		//validates the fileds
		if(pConservative + pBold + pMiser != 100){
			String message = String.format("Percentage of consumers profiles must total 100");
			JOptionPane.showMessageDialog(null, message);
			isOk = false;
		}

        text = nuEnterprises.getText();
		if(text.length() == 0)
			numEnterprises = 0;
		else
        	numEnterprises = Integer.parseInt(text);

        text = percInvestor.getText();
		if(text.length() == 0)
			pInvestor = 0;
		else
        	pInvestor = Integer.parseInt(text);

        text = percDecadent.getText();
		if(text.length() == 0)
			pDecadent = 0;
		else
        	pDecadent = Integer.parseInt(text);

	    text = percCheater.getText();
		if(text.length() == 0)
			pCheater = 0;
		else
			pCheater = Integer.parseInt(text);

        text = percGreedy.getText();
		if(text.length() == 0)
			pGreedy = 0;
		else
        	pGreedy = Integer.parseInt(text);

        text = percStrategist.getText();
		if(text.length() == 0)
			pStrategist = 0;
		else
        	pStrategist = Integer.parseInt(text);

        text = percWholesaler.getText();
		if(text.length() == 0)
			pWholesaler = 0;
		else
        	pWholesaler = Integer.parseInt(text);

        text = percReactive.getText();
		if(text.length() == 0)
			pReactive = 0;
		else
        	pReactive = Integer.parseInt(text);

		//validates the fileds
		if(pInvestor + pDecadent + pCheater + pGreedy + pStrategist + pWholesaler + pReactive != 100){
			String message = String.format("Percentage of enterprises profiles must total 100");
			JOptionPane.showMessageDialog(null, message);
			isOk = false;
		}

        text = timewhen.getText();
		if(text.length() == 0)
			when = 0;
		else
        	when = Integer.parseInt(text);

        if(enabled.isSelected())
            enableRumour = true;
        else
            enableRumour = false;

        if (trueRumour.isSelected())
            isTrue = true;
        else
            isTrue = false;

        if(positive.isSelected())
            isPositive = true;
        else
            isPositive = false;
       
		//if all the parametrs are ok, then executes the simulation
		if(isOk == true){
			final String[] columnNames = {"First Name",
	                "Last Name",
	                "Sport",
	                "# of Years",
	                "Vegetarian"
	        };
			 final Object[][] data = {
					 {"Mary", "Campione",
						 "Snowboarding", new Integer(5), new Boolean(false)},
						 {"Alison", "Huml",
							 "Rowing", new Integer(3), new Boolean(true)},
							 {"Kathy", "Walrath",
								 "Knitting", new Integer(2), new Boolean(false)},
								 {"Sharon", "Zakhour",
									 "Speed reading", new Integer(20), new Boolean(true)},
									 {"Philip", "Milne",
										 "Pool", new Integer(10), new Boolean(false)}
			 };	 
		     Tabela.createAndShowGUI(columnNames,data);
			sm.setParameters(cycles, numConsumers, pConservative, pBold, pMiser, numEnterprises, pInvestor, pDecadent, pCheater, pGreedy, pStrategist, pWholesaler, pReactive, enableRumour, isTrue, isPositive, when, pConsumers);
			try{
				sm.simulate();
			}catch(IOException io){
				System.err.println("Error writing file");
				System.exit(1);
			}
			System.exit(0);
		}
    }

	public void initialStep(){
		JFrame initial = new JFrame();
		initial.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		initial.setUndecorated(true);
		initial.setLocation(370,230);
		Icon picture = new ImageIcon( getClass().getResource("TelaInicial.jpeg"));
		JLabel label = new JLabel();
		label.setIcon(picture);
		initial.getContentPane().add(label);
		initial.setSize(362,267);
		initial.setVisible(true);
		try{
			Thread.sleep(4000);
		}
		catch(Exception e){
		}
		initial.dispose();

	}

	public static void main(String[] args){
		Repart repart = new Repart();
	    repart.initialStep();
	    
		repart.launchFrame();
	}
}


}

[chyrl]

Could you post an SSCCE for your concern.