Tie classes together

Question

I want to include the shapes (my inventory logo) on the next button frame, which should display the next item on the array list (I havent gotten to the array yet). Both of these classes run when apart, but do not work together. Help?Advice?(Please dont tell me to drop the class)
Only one more week to go in this class (and Im pretty sure I will pass) whew...i know yall will be happy when I go away lol
     import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class InventoryGUI1 extends JFrame
                          implements ActionListener {
    JTextField input;
      JTextField output;
      JButton next;
      Container c;
public InventoryGUI1 (){
    super ("My Inventory GUI");
      input = new JTextField (15);
      output = new JTextField (15);
      output.setEditable(false);
      next = new JButton ("next->");
      next.addActionListener (this);
      c = getContentPane ();
      c.setLayout (new FlowLayout());
      c.add (input);
      c.add (next);
      c.add (output);
      setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
      setSize (400,300);
public void actionPerformed (ActionEvent ev) {
    String userInput = input.getText ();
      output.setText (userInput);
      input.selectAll();
public static void main (String args []) {
InventoryGUI1 app = new InventoryGUI1 ();
app.setVisible (true);
SwingDrawInner app = new SwingDrawInner ();
app.setVisible (true);
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class SwingDrawInner extends JFrame {
Container fc;
DrawingSurface ds;
JLabel lbl;
public SwingDrawInner() {
super("A Swing Drawing Application");
ds = new DrawingSurface();
lbl = new JLabel("Stephanie's Music Inventory");
fc = getContentPane();
fc.setLayout(new FlowLayout());
fc.add(ds);
fc.add(lbl);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300,200); }
class DrawingSurface extends JPanel {
Dimension preferredSize = new Dimension(300,100);
public DrawingSurface() {
super();
public Dimension getPreferredSize() {
return preferredSize;
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawOval(20, 20, 80, 60 );
g.drawRect(110, 20, 80, 60);
g.drawOval(200, 20, 80, 60);
public static void main(String args[]) {
SwingDrawInner app = new SwingDrawInner();
app.setVisible(true);
public static void main (String args []) {
InventoryGUI1 app = new InventoryGUI1 ();
app.setVisible (true);
SwingDrawInner app = new SwingDrawInner ();
app.setVisible (true);
                          

Answer 1

Additionally
-- Learn to format your code according to the conventions. It's difficult to read code that's all jammed up together.
[http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html]
-- For anything more complicated than the most basic GUIs, you need to show the GUI on the EDT. For that, your main method in the code I posted above would look like:    public static void main (String args []) {
        SwingUtilities.invokeLater (new Runnable () {
            public void run () {
                InventoryGUI1 app = new InventoryGUI1 ();
                app.setVisible (true);
                SwingDrawInner app1 = new SwingDrawInner ();
                app1.setVisible (true);
    }db