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How to pass JTextfield info from a JDialog into a JFrame (separate classes)

I have been trying to pass the info of my JTextField that is in a JDialog into my JFrame. Both the JDialog and JFrame are in separate classes. I have tried to store the JTextField into a JLable using the .setText and .getText and then passing the JLable into the JFrame but with no luck.
I know there are many similar questions but I have tried many different approaches but still no luck. I am relatively new to Java and do not know all the in's and out's. Any help is very appreciated!
My code for the JFrame:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JPanel;
public class StockApp extends JFrame implements PropertyChangeListener {
private JPanel main = new JPanel();
private JPanel north = new JPanel();
private JPanel center = new JPanel();
private JPanel south = new JPanel();
private JButton buyStock = new JButton("Buy Stock");
private JButton sellStock = new JButton("Sell Stock");
public TestTest variables = new TestTest();
private JLabel stockNameNorth = new JLabel("Stock Name");
private JLabel stockPriceNorth = new JLabel("Stock Price");
String stockName = variables.getStockName();
String stockPrice = variables.getStockPrice();
public StockApp() {
setTitle("StockApp");
getContentPane().setBackground(Color.white);
setSize(400,400);
setLocation(500,200);
setVisible(true);
main.setLayout(new BorderLayout());
north.setLayout(new FlowLayout());
center.setLayout(new FlowLayout());
south.setLayout(new FlowLayout());
stockNameNorth.setText(stockName);
stockPriceNorth.setText(stockPrice);
add(main);
north.add(stockNameNorth);
north.add(stockPriceNorth);
south.add(buyStock);
south.add(sellStock);
main.add(north, BorderLayout.NORTH);
main.add(center, BorderLayout.CENTER);
main.add(south, BorderLayout.SOUTH);
}
}
And Dialog:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TestTest extends JDialog implements ActionListener {
private JPanel main = new JPanel();
private JPanel north = new JPanel();
private JPanel center = new JPanel();
private JPanel south = new JPanel();
private JLabel stockNameLabel = new JLabel("Stock name: ");
private JLabel stockPriceLabel = new JLabel("Stock price(£): ");
private JTextField stockNameIn = new JTextField(5);
private JTextField stockPriceIn = new JTextField(5);
private JButton buttonOK = new JButton("OK");
public JLabel stockPrice = new JLabel();
public JLabel stockName = new JLabel();
public TestTest() {
getContentPane().setBackground(Color.white);
setSize(400,400);
setLocation(500,200);
setModal(false);
setVisible(true);
getRootPane().setDefaultButton(buttonOK);
main.setLayout(new BorderLayout());
north.setLayout(new FlowLayout());
center.setLayout(new FlowLayout());
south.setLayout(new FlowLayout());
add(main);
north.add(stockNameLabel);
north.add(stockNameIn);
center.add(stockPriceLabel);
center.add(stockPriceIn);
south.add(buttonOK);
main.add(north, BorderLayout.NORTH);
main.add(center, BorderLayout.CENTER);
main.add(south, BorderLayout.SOUTH);
buttonOK.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == buttonOK){
stockName.setText(stockNameIn.getText());
stockPrice.setText(stockPriceIn.getText());
dispose();
new StockApp();
}
}
public String getStockName() {
return stockNameIn.getText();
}
public String getStockPrice() {
return stockPriceIn.getText();
}
}
I am trying to pass the stockName and stockPrice variables from the JDialog into the JFrame. I then want the name and price to display at the top of the JFrame.

For demonstration, what the problem is, we need less Fields and Buttons.
So far, no component of StockApp needs to be accessed from different methods, so there is no need to make them visible outside of the ctor.
More explanations in the code.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JPanel;
public class StockApp extends JFrame {
public StockApp() {
// move those unreferenced panels here, so we don't have to reason about them:
JPanel main = new JPanel();
JPanel north = new JPanel();
JPanel center = new JPanel();
JPanel south = new JPanel();
// add price later, when name works
JButton buyStock = new JButton("Buy Stock");
JLabel stockNameNorth = new JLabel("Stock Name");
// critical change: Make the label, which you like to update,
// accessible by whom it should be updated:
TestTest variables = new TestTest (stockNameNorth);
setTitle ("StockApp");
getContentPane().setBackground(Color.white);
setSize (600,400);
setLocation (500,200);
setVisible (true);
// make the close-frame action terminate the program:
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
main.setLayout (new BorderLayout());
north.setLayout (new FlowLayout());
center.setLayout (new FlowLayout());
south.setLayout (new FlowLayout());
add (main);
north.add (stockNameNorth);
south.add (buyStock);
main.add (north, BorderLayout.NORTH);
main.add (center, BorderLayout.CENTER);
main.add (south, BorderLayout.SOUTH);
}
// Main method to start the damn thing
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new StockApp ();
}
});
}
}
// no need to make this class public in a short test:
class TestTest extends JDialog implements ActionListener {
// this are elements, visible outside the construction phase,
// we need to have access to from more than one method.
// Make this important distinction visible to the reader:
JLabel name;
JTextField stockNameIn = new JTextField (5);
JButton buttonOK = new JButton ("OK");
// add the JLabel to update to the ctor, so that it can't be forgotten
// to be set
public TestTest (JLabel pname) {
// we copy the reference to the label, to have access to it in
// the actionPerformed method.
name = pname;
JPanel main = new JPanel();
JPanel north = new JPanel();
JPanel center = new JPanel();
JPanel south = new JPanel();
JLabel stockNameLabel = new JLabel ("Stock name: ");
getContentPane().setBackground(Color.white);
// different size/location than frame, so that they don't hide
// each other completly
setSize (400,600);
setLocation (700,300);
setModal (false);
setVisible (true);
getRootPane().setDefaultButton(buttonOK);
main.setLayout (new BorderLayout());
north.setLayout (new FlowLayout());
center.setLayout (new FlowLayout());
south.setLayout (new FlowLayout());
add (main);
north.add (stockNameLabel);
north.add (stockNameIn);
south.add (buttonOK);
main.add (north, BorderLayout.NORTH);
main.add (center, BorderLayout.CENTER);
main.add (south, BorderLayout.SOUTH);
buttonOK.addActionListener(this);
}
// here we need access to the button - was it the OK-Button, clicked?
// and the textfield stockNameIn, to read the text
// and the name field from the frame, to set the text
public void actionPerformed(ActionEvent e) {
if (e.getSource () == buttonOK) {
name.setText (stockNameIn.getText());
dispose();
}
}
}

JFrame doesn't display components

I have problem with displaying components on my JFrame. I'm closing my current window and opening new one and want to display jLabel on it but nothing is happening. Code is below :
Frame[] nF = DBChooser.getFrames();
nF[0].setVisible(false);
JFrame windoow = new JFrame("Processing");
JPanel pan = new JPanel();
windoow.setPreferredSize(new Dimension(400, 150));
pan.setPreferredSize(new Dimension(400, 150));
JLabel textLabel = new JLabel ("Processing...");
textLabel.setLayout(null);
pan.setLayout(null);
windoow.setLayout(null);
pan.add(textLabel);
pan.revalidate();
pan.repaint();
windoow.getContentPane().add(pan);
windoow.setLocationRelativeTo(null);
windoow.pack();
windoow.setVisible(true);
I appreciate any help

Why you need so many setLayout(null); ? I remove them and it worked
public class DBChooser extends Frame {
public static void main(String args[]) {
Frame[] nF = DBChooser.getFrames();
// nF[0].setVisible(false);
JFrame windoow = new JFrame("Processing");
JPanel pan = new JPanel();
windoow.setPreferredSize(new Dimension(400, 150));
pan.setPreferredSize(new Dimension(400, 150));
JLabel textLabel = new JLabel("Processing...");
// textLabel.setLayout(null);
// pan.setLayout(null);
// windoow.setLayout(null);
pan.add(textLabel);
pan.revalidate();
pan.repaint();
windoow.getContentPane().add(pan);
windoow.setLocationRelativeTo(null);
windoow.pack();
windoow.setVisible(true);
}
}

It is because you set a null layout to window and panel without specifying any width, lenght or position, either use some LayoutManager or set these properties (eg. bounds). A null LayoutManager means that you need to set everything yourself, because there is nothing (no LayoutManager) that would place your elements automatically. This example uses a BorderLayout, which creates a nice effect:
the code:
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Test {
public static void main(String[] args) {
JFrame windoow = new JFrame("Processing");
JPanel pan = new JPanel();
windoow.setPreferredSize(new Dimension(400, 150));
pan.setPreferredSize(new Dimension(400, 150));
JLabel textLabel = new JLabel("Processing...");
textLabel.setLayout(null);
pan.setLayout(new BorderLayout());
windoow.setLayout(new BorderLayout());
pan.add(textLabel);
pan.revalidate();
pan.repaint();
windoow.getContentPane().add(pan);
windoow.setLocationRelativeTo(null);
windoow.pack();
windoow.setVisible(true);
}
}

Not Having any output after having added two JPanel on a JLayeredPane

What I'm trying to do is overwriting two panels, where I am Inserting an Image in the background panel through the use of a JLabel, and I want another smaller panel to appear on that same background Image! Here is what I have written:
import javax.swing.*;
import javax.swing.text.html.ImageView;
import java.awt.*;
public class addImage extends JFrame {
private JLabel label;
private ImageIcon Image;
private JButton b;
private JPanel panel1;
private JPanel panel2;
private JLayeredPane layerpanel;
public addImage() {
// JFRame
super("First Time adding Image");
setLayout(null);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 400);
// JLabel containing Image
Image = new ImageIcon(getClass().getResource("image1.jpg"));
// Adding Image in JLabel
label = new JLabel(Image);
// Adding Label to panel1
panel1 = new JPanel();
panel1.add(label);
// JPanel2
panel2 = new JPanel();
panel2.setBackground(Color.darkGray);
panel2.setPreferredSize(new Dimension(200, 200));
panel2.setOpaque(true);
// LAyeredPane adding both panels
layerpanel = new JLayeredPane();
layerpanel.setLayout(new BorderLayout());
layerpanel.add(panel1, new Integer(0), 0);
layerpanel.add(panel2, new Integer(1), 1);
add(layerpanel);
}
public static void main(String[] args) {
new addImage();
}
}
After executing the piece of code Im not getting any output except the empty frame!
I am getting these errors :
Exception in thread "main" java.lang.IllegalArgumentException: cannot add to layout: constraint must be a string (or null)
at java.awt.BorderLayout.addLayoutComponent(Unknown Source)
at java.awt.Container.addImpl(Unknown Source)
at javax.swing.JLayeredPane.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at addImage.<init>(addImage.java:45)
at addImage.main(addImage.java:53)
I have checked all the question related but still I have not been able to find the solution!!!!
Any kind of help will be appreciated ! Thank you

You're problem is here:
layerpanel.setLayout(new BorderLayout());
layerpanel.add(panel1, new Integer(0), 0);
layerpanel.add(panel2, new Integer(1), 1);
and it's not helped by
setLayout(null);
The JLayeredPane now requires that you pass it one of the valid constraints for BorderLayout (like BorderLayout.NORTH).
Having said that, I'm not sure what you hope to achieve doing this.
You could get the same effect by using a CardLayout with a lot less mess, see How to Use CardLayout for more details
I can "replicate" your desired output using something like...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
public class AddImage extends JFrame {
private JLabel label;
private ImageIcon Image;
private JButton b;
private JPanel panel1;
private JPanel panel2;
private JLayeredPane layerpanel;
public AddImage() {
// JFRame
super("First Time adding Image");
setLayout(new BorderLayout());
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 400);
// JLabel containing Image
// Image = new ImageIcon(getClass().getResource("image1.jpg"));
// Adding Image in JLabel
label = new JLabel("Help");
// Adding Label to panel1
panel1 = new JPanel();
panel1.add(label);
// JPanel2
panel2 = new JPanel();
panel2.setBackground(Color.darkGray);
panel2.setPreferredSize(new Dimension(200, 200));
panel2.setOpaque(true);
// LAyeredPane adding both panels
layerpanel = new JLayeredPane();
layerpanel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
layerpanel.add(panel1, gbc);
layerpanel.add(panel2, gbc);
layerpanel.setLayer(panel1, new Integer(0));
layerpanel.setLayer(panel2, new Integer(1));
add(layerpanel);
}
public static void main(String[] args) {
new AddImage();
}
}

Position JLabel within JPanel

I want to position a JLabel within a JPanel, so that it appears at the top of the window. I then want to position two drop-down menu below that so that the user can choose from two sets of options.
How would I go about positioning these elements?

Here's a JLabel title with two JComboBoxes. I have no idea what else you mean by a "drop-down menu".
I created a JPanel with a BorderLayout to hold the GUI.
The title is a JLabel inside of a JPanel using the default FlowLayout.
The JComboBoxes are inside of a JPanel using the default FlowLayout.
Here's the code:
package com.ggl.testing;
import java.awt.BorderLayout;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class DropDownLayout implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new DropDownLayout());
}
#Override
public void run() {
JFrame frame = new JFrame("Drop Down Layout");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(createTitlePanel(), BorderLayout.NORTH);
panel.add(createDropDownPanel(), BorderLayout.CENTER);
frame.add(panel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel createTitlePanel() {
JPanel panel = new JPanel();
JLabel titleLabel = new JLabel("Title");
panel.add(titleLabel);
return panel;
}
private JPanel createDropDownPanel() {
JPanel panel = new JPanel();
DefaultComboBoxModel<String> model1 = new DefaultComboBoxModel<String>();
model1.addElement("Selection 1");
model1.addElement("Selection 2");
model1.addElement("Selection 3");
model1.addElement("Selection 4");
JComboBox<String> comboBox1 = new JComboBox<String>(model1);
panel.add(comboBox1);
DefaultComboBoxModel<String> model2 = new DefaultComboBoxModel<String>();
model2.addElement("Choice 1");
model2.addElement("Choice 2");
model2.addElement("Choice 3");
model2.addElement("Choice 4");
JComboBox<String> comboBox2 = new JComboBox<String>(model2);
panel.add(comboBox2);
return panel;
}
}

Creating JSplitPane with 3 panels

I would like to create a window, with 3 jPanels, separated by splitPane-s. The left, and the right one should be resizable by the user, and the one in the middle should fill the remaining space.
I've created it, but if I move the first splitPane, then the second one is also moving. And I'm not sure, if I use the best method for what I want.
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
public class MyWindow extends JFrame {
public MyWindow() {
this.setLayout(new BorderLayout());
JPanel leftPanel = new JPanel();
JPanel centerPanel = new JPanel();
JPanel centerPanel2 = new JPanel();
JPanel rightPanel = new JPanel();
JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftPanel, centerPanel);
JSplitPane sp2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, centerPanel2, rightPanel);
centerPanel.setLayout(new BorderLayout());
this.add(sp, BorderLayout.CENTER);
centerPanel.add(sp2, BorderLayout.CENTER);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(500, 500);
this.setVisible(true);
}
}

What you're doing looks pretty weird to me i.e adding the centerPanel to the split pane, then adding the split pane to the centerPane. Not sure, but I think that the latter negates the former.
All you need to do is add the first split pane to the second split pane.
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.SwingUtilities;
public class MyWindow extends JFrame {
public MyWindow() {
this.setLayout(new BorderLayout());
JPanel leftPanel = new JPanel();
leftPanel.setBackground(Color.BLUE);
JPanel centerPanel = new JPanel();
centerPanel.setBackground(Color.CYAN);
JPanel rightPanel = new JPanel();
rightPanel.setBackground(Color.GREEN);
JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftPanel, centerPanel);
JSplitPane sp2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, sp, rightPanel);
this.add(sp2, BorderLayout.CENTER);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(500, 500);
this.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
new MyWindow();
}
});
}
}