GUI Linking

Question

I have been set an assignment to connect a java program to an oracle database. I wanted to put a GUI interface on top of the program. I was wondering how you can connect the GUI together for example on my code i have a read in from database button and when it is pressed i want it to read in data from the database and then i want it to go to a separate GUI that can display the data. How would i display the data would it have to be put into a large text box or is there a more appropriate way of doing this. Also how would i simply link two GUI interfaces together so that when one is pressed with for example a button to say to next it would go to another menu. Sorry if this is very wordy. I'm not sure if you would just use a extends or something like that.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class LeagueGUI extends JFrame implements ActionListener{
     private JPanel pnlPanel;
     private JButton btnRead, btnUpdate, btnReadDatabase, btnDisplayUpdated;
     private JFrame frmFrame;
    private JLabel lblpicture;
     public LeagueGUI(){
          setTitle("League Table");
          setSize(900,600);
        pnlPanel = new JPanel();
          pnlPanel.setLayout(null);
        pnlPanel.setBackground(Color.blue);
        ImageIcon LeagueGUI = new ImageIcon("Premier.jpg");
        lblpicture = new JLabel(LeagueGUI);
        lblpicture.setBounds(430, 10, 100, 500);
        pnlPanel.add(lblpicture);
        btnRead = new JButton("Match Results");
          btnRead.setBounds(50, 450, 200, 100);
          btnRead.addActionListener(this);
          pnlPanel.add(btnRead);
          btnUpdate = new JButton("Update");
          btnUpdate.setBounds(250, 450, 200, 100);
          btnUpdate.addActionListener(this);
          pnlPanel.add(btnUpdate);
        btnReadDatabase = new JButton("Read Database");
          btnReadDatabase.setBounds(450, 450, 200, 100);
          btnReadDatabase.addActionListener(this);
          pnlPanel.add(btnReadDatabase);
        btnDisplayUpdated = new JButton("Display Updated");
          btnDisplayUpdated.setBounds(650, 450, 200, 100);
          btnDisplayUpdated.addActionListener(this);
          pnlPanel.add(btnDisplayUpdated);
          getContentPane().add(pnlPanel);
          setVisible(true);
        public void actionPerformed(ActionEvent event) {
          Object source = event.getSource();
          if (source == btnRead)     {
          else if (source == btnUpdate) {
         public static void main(String[] args)     {
          LeagueGUI League = new LeagueGUI();
}thank you in advance for your help please let me know if u need more specific information.

Answer 1

if i were doing this i would first write a bunch of functions that will handle connecting to the database and getting back the values formatted the way you will want them displayed.
after that i would start working on the GUI and linking it all together. you can easily add listeners to buttons (and other things) that can detect when they have been clicked -- once you detect the click you can call any functions / do anything you'd like (in this case you would call the database code you wrote).
if you google around you should be able to find some basic JDBC examples of java connecting to oracle databases.
let me know if you need anything else.