How to pass JTextField txtSearch between testUserInterface class and testSearch class

I am try to pass txtSearch as an JTextField object from testUserInterface to testSearch.
However, I got an error saying

Code:

---

java.lang.StackOverflowError
        at java.awt.Insets.<init>(Insets.java:103)
        at sun.awt.windows.WToolkit.getScreenInsets(Native Method)
        at sun.awt.windows.WToolkit.getScreenInsets(WToolkit.java:567)
        at java.awt.Window.init(Window.java:498)
        at java.awt.Window.<init>(Window.java:536)
        at java.awt.Frame.<init>(Frame.java:420)
        at java.awt.Frame.<init>(Frame.java:385)
        at javax.swing.JFrame.<init>(JFrame.java:180)
        at testUserInterface.<init>(testUserInterface.java:65)
        at testSearch.<init>(testSearch.java:29)
        at testUserInterface.<init>(testUserInterface.java:168)

---

I wonder that something is wrong with my code,

line 29 in testSearch shows problem with public testSearch()

line 168 in testUserInterface shows problem with ts = new testSearch();

below are what I have changed

I added a method:

Code:

---

public JTextField getSearchBox()
{
    return txtSearch;
}

---

in testUserInterface class

Code:

---

import java.awt.*;
    import java.awt.event.*;
   
    import javax.swing.*;
    import javax.swing.JMenu;
    import javax.swing.JMenuItem;
    import javax.swing.JMenuBar;
    import javax.swing.KeyStroke;
    import javax.swing.ImageIcon;
    import javax.swing.JPanel;
   
    import java.util.*;
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.Random;
   
    import com.aetrion.flickr.*;        // For FlickrJ classes.
    import com.aetrion.flickr.photos.*;
   
    import java.io.*; //for writing and reading file
   
    public class testUserInterface extends JFrame implements ActionListener
    {
    /**
    * @param Declaring all components for user interface
    * @param Firslty, to declare components of menu such as
    * @param JMenuBar to create a menu bar
    * @param JMenu to create a menu on the menu bar such as menu File.
    * @param JMenuItem to create a submenu of the menu such as fExit is a submenu of menu File.
    */   
        private JMenuBar menuBar;
        private JMenu file, menu, help;
        private JMenuItem fExit, mUpload, mRecentPhoto, mSearch, hGuide, hAuthor;
        private JPanel upperPanel, centerPanel, InforPanel,imgPanel, recentPhotoPanel;
        public  JPanel searchPhotoPanel;
        private JLabel welcome, lWelcome, lAbout, recentPhotoTitle, searchTitle;
       
        ImageIcon iWelcome = new ImageIcon("IMAGE/flickr.jpg", "Flickr Image");
        ImageIcon iAbout = new ImageIcon("IMAGE/FairyTail.jpg", "Fairy Tail Team");
   
   
    * @param this to declare all components that should be in Search Panel
    * @param JButton btnStart, btnExit.
    * @param JLabel lblSearch
    * @param JTextField txtSearch
    */
        private JButton btnStart, btnExit;
        private JLabel lblSearch;
        private JTextField txtSearch;
        private JPanel sContent;
        private testSearch ts;
       
       
        public testUserInterface ()
        {
           
            //Add regular components to the window, using the default BorderLayout.
            Container contentPane = getContentPane(); //the app window       
            // create upper panel to hold menu bar on the top of interface
            upperPanel = new JPanel();
            contentPane.add(upperPanel, BorderLayout.NORTH);
            upperPanel.setLayout(new BorderLayout());
            // Create menu bar to hold menus and submenus
            menuBar = new JMenuBar();
            //add menu bar to the top of interface
            upperPanel.add(menuBar);     
               
            // Build File menu and its short-cut key
            file = new JMenu ("File");       
            file.setMnemonic(KeyEvent.VK_F);
            file.getAccessibleContext().setAccessibleDescription(
                "File related operations");
            // Create a submenu for File menu and ist short-cut key
            fExit = new JMenuItem ("Exit", KeyEvent.VK_E);
            fExit.addActionListener(this);
            // add components of File menu
            menuBar.add(file);
            file.add(fExit);
           
            // Build  Menu menu and its short-cut key
            menu = new JMenu ("Menu");       
            menu.setMnemonic(KeyEvent.VK_M);
            menu.getAccessibleContext().setAccessibleDescription(
                "Menu related operations");
            // Create submenus for Menu menu and its short-cut key
            mRecentPhoto = new JMenuItem ("Check Recent Photos", KeyEvent.VK_C);
            mSearch = new JMenuItem ("Search Photos", KeyEvent.VK_S);
            // add components of File menu
            menuBar.add(menu);
            menu.add(mRecentPhoto);
            mRecentPhoto.addActionListener(this);
            menu.addSeparator();
            menu.add(mSearch);
            mSearch.addActionListener(this);
           
            // Build  Help Menu and its short-cut key
            help = new JMenu ("Help");   
            help.setMnemonic(KeyEvent.VK_H);
            help.getAccessibleContext().setAccessibleDescription(
                "Help related operations");
            // Create submenus for Help Menu and their short-cut key
            hGuide = new JMenuItem ("Short-Cut Key Guide", KeyEvent.VK_S);
            hAuthor = new JMenuItem ("About Us", KeyEvent.VK_A);
            // add components of help menu
            menuBar.add(help);
            help.add(hGuide);
            hGuide.addActionListener(this);
            help.addSeparator();
            help.add(hAuthor);
            hAuthor.addActionListener(this);
           
            // Build Center Panel which is stayed in the center of interface.
            centerPanel = new JPanel();
            centerPanel.setLayout (new FlowLayout());
            contentPane.add(centerPanel, BorderLayout.CENTER);     
           
            // Build Infor Panel and display Image and Text.
            InforPanel = new JPanel();
            InforPanel.setLayout (new BorderLayout());
            centerPanel.add(InforPanel);
            // Build components for Infor Panel
            welcome = new JLabel ("Welcome to Java Flickr Application", JLabel.CENTER);
            InforPanel.add(welcome, BorderLayout.NORTH );
            lWelcome = new JLabel (iWelcome); 
            InforPanel.add(lWelcome);
           
            //Build recent Photo Panel to display most recent photos
            recentPhotoPanel = new JPanel();
            recentPhotoPanel.setLayout (new BorderLayout());
            recentPhotoPanel.setVisible(false);
            recentPhotoTitle = new JLabel ("Most Recent Photos on Flickr");
            recentPhotoPanel.add(recentPhotoTitle);
            centerPanel.add(recentPhotoPanel);
           
            //Build Search Panel to display area where user can search photos with a keyword
            searchPhotoPanel = new JPanel ();
            searchPhotoPanel.setLayout (new BorderLayout());
            searchPhotoPanel.setVisible(false);
            searchTitle = new JLabel ("Welcome to Search Area", JLabel.CENTER);
            searchPhotoPanel.add(searchTitle, BorderLayout.NORTH);
            centerPanel.add(searchPhotoPanel);
           
    /**
   
        * @param code below to build all components that should be in Search Panel
        * @param adding all components and display them in Search Panel
        * @param Handling events when user clicks on button Search
        * @param JTextField txtSearch
        */
                // Build Components for Search
                sContent = new JPanel(); // content Panel to display
                sContent.setLayout( new FlowLayout());
                lblSearch =  new JLabel("Search");
                txtSearch = new JTextField(20);
                btnStart = new JButton("Start");
                btnExit = new JButton("Exit");
                ts = new testSearch();
                // add action handling for 2 buttons
                btnStart.addActionListener(ts);
                btnExit.addActionListener(ts);
                //Add components to Search Panel and action handling   
                sContent.add(lblSearch);
                sContent.add(txtSearch);
                sContent.add(btnStart);
                sContent.add(btnExit);
                searchPhotoPanel.add(sContent, BorderLayout.CENTER);
                // End Search components
               
            }
           
            public static void main(String[] args)
            {
                testUserInterface test = new testUserInterface ();
                test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                test.setTitle("Java Flickr Application");
                test.setSize(800,600);
                test.setVisible(true);
            }
           
            public JTextField getSearchBox()
            {
                return txtSearch;
            }
           
            public void actionPerformed(ActionEvent e)
            {
                if (e.getSource() instanceof JMenuItem)
                {
                    JMenuItem source = (JMenuItem)(e.getSource());
                    //If user selects "Short-cut Key Guide" sub-menu, a dialog will be shown
                    if (source.equals(hGuide))
                    {
                       
                                JOptionPane.showMessageDialog( testUserInterface.this,
                                "Select appropriate menu option that you want from Java Flickr Application\n" +
                                "User should navigate to menu before submenu\n" +
                                "Alt + F => select File menu \n" +
                                "Alt + E => select Exit submenu \n" +
                                "Alt + M => select Menu menu \n" +
                                "Alt + C => select Check Recent Photos submenu \n" +
                                "Alt + S => select Search submenu \n" +
                                "Alt + H => select Help menu \n" +
                                "Alt + S => select Short-cut Key Guide submenu \n" +
                                "Alt + A => select About Us submenu \n" ,
                                "Help Contents", JOptionPane.PLAIN_MESSAGE);
                       
                    }
                    //If user selects "About Us" sub-menu, a dialog will be shown
                    if (source.equals(hAuthor))
                    {
                        JOptionPane.showMessageDialog( testUserInterface.this,
                                "Java Flickr Application is created by Fairy Tail Group \n\n" +
                                "Hung Vu Pham\n\n" +
                                "Jennifer Naiaretti\n\n" +
                                "Panagiota Tzana\n\n" +
                                "Athina Ioannou",
                                "About Us", JOptionPane.PLAIN_MESSAGE, iAbout);
                    }
                    //If user selects "Check Recent Photos" sub-menu, a panel to retrieve all photos from Flickr and display photos
                    if (source.equals(mRecentPhoto))
                    {
                        InforPanel.setVisible(false);
                        searchPhotoPanel.setVisible(false);
                        recentPhotoPanel.setVisible(true);
                    }
                    //If user selects "Search Photos" sub-menu, a panel to help user search photos on Flickr with specific keyword
                    //This panel also contains all photo after searching.
                    if (source.equals(mSearch))
                    {
                        InforPanel.setVisible(false);
                        recentPhotoPanel.setVisible(false);
                        searchPhotoPanel.setVisible(true); 
                       
                    }
                    //If "Exit" sub-menu is selected, a window closes.
                    if (source.equals(fExit))
                    {
                        dispose();
                        System.exit(0);
                    }
                }
            }
        }

---

then I call the method getSearchBox()

Code:

---

public testSearch()
 {
  getSearchBox();
 }

---

in testSearch class

Code:

---

    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.Random;
    import javax.swing.*;
    import com.aetrion.flickr.*;        // For FlickrJ classes.
    import com.aetrion.flickr.photos.*;
   
    public class testSearch extends testUserInterface implements ActionListener{
        private PhotoPanel pp;
        private String keyWord;
        private String photoUrl;
        private PhotoFinder pf;
        private Timer timer;
        private ArrayList<Photo> photoList;
        private String originalKeyWord, oldKeyWord;
        /**
        * Creates new form SearchInterface
        */
        public testSearch()
        {
            getSearchBox();
        }
       
        public void init()
        {
            pp = new PhotoPanel();
            pp.setLayout(new FlowLayout());
            searchPhotoPanel.add(pp, BorderLayout.SOUTH);
            pp.setVisible(true);
            pf = new PhotoFinder();
            photoList = new ArrayList<Photo>();
            originalKeyWord = "";
            oldKeyWord = "";
            //titles = new ArrayList<String>();
            timer = new Timer(1000, this);
            //btnStart = new JButton("Search");
            pack();
            setVisible(true);
        }
        @Override
        public void actionPerformed(ActionEvent e)
        {
           
            if (e.getActionCommand().equals("Exit"))
            {
                    System.exit(0);
            }
            if (e.getActionCommand().equals("btnStart"))
            {
                if (timer.isRunning())
                {
                    timer.stop();
                }
                keyWord = getSearchBox().getText();
                originalKeyWord = keyWord;
                oldKeyWord = keyWord;
                timer.start();
            }
            else
            {
                if (keyWord != null)
                {
                  Random r = new Random();
                    photoList.clear();
                   
                    photoList = pf.doQuery(keyWord);
                    int i = r.nextInt(photoList.size());
                    pp.setImage(photoList.get(i).getSmallUrl());
                    keyWord = photoList.get(i).getTitle();
                    Iterator it = photoList.iterator();
                    while (keyWord.equals(""))
                    {
                        Photo p = (Photo)it.next();
                        keyWord = p.getTitle();
                    }
                  // if (oldKeyWord.equals(keyWord))
                    //{
                      // keyWord = originalKeyWord;
                      // }
                    //oldKeyWord = keyWord;
                    keyWord = originalKeyWord;
                    {
                        //int num = photoList.size();
                    //for (int k=1; k< num; k++)
                    pp.repaint();
                    }
                    System.out.println(keyWord);
                }
            }
        }
    }

---

Finally, I got error with StackOverflow

How can I fix this error ??? please help me sorting out the problem

Thanks a lot for your help

Kind Regards

You appear to be using inheritance incorrectly. There is likely no reason to have the one class extend the other, and in fact your doing this is what is causing your problem. Your base class creates an instance of the Child class (something that should *never* be done), and then this will force the Child class to continue to create itself infinitely, or until the JVM runs out of memory.

Solution: completely re-think your design.

Also posted at Java and Flickr - Help with Inheritance between Main Class and sub-class

And he was asked in his previous thread to post links to cross-posts but yet he ignores this request. Shame.