How to set the frame size?

Hi,
Can some one show me how to set the frame size in this program? History: I have created a window and added a button but its to small. So I want to increase the size of the frame to at least 600X400 pixel.
private static void showGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("ButtonDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        Main newContentPane = new Main();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }It would be nice if you could show me how to do it.
Thank you very much for reading this.

Challenger wrote:
Simply adding
frame.setSize(new Dimension(600,400));to the end of your code should work perfectly.Or, if you want to do it correctly, .setPreferredSize() on your frame before you .pack() it. The default layout manager for JFrame is BorderLayout, which uses the preferredSize of each component to calculate sizes during the .pack() call.

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How do I set the frame size

I am Making a program for purchasing games, with the basic layout alsot done, except on problem. When the purchase button is pressed, a dialog shows up but nothing is seen until i resize it. How would i set the frame size so that i do not need to resize it each time? below is the code for the files. Many thanks in advance.
CreditDialog
import java.awt.*;
import java.awt.event.*;
class CreditDialog extends Dialog implements ActionListener { // Begin Class
     private Label creditLabel = new Label("Message space here",Label.RIGHT);
     private String creditMessage;
     private TextField remove = new TextField(20);
     private Button okButton = new Button("OK");
     public CreditDialog(Frame frameIn, String message) { // Begin Public
          super(frameIn); // call the constructor of dialog
          creditLabel.setText(message);
          add("North",creditLabel);
          add("Center",remove);
          add("South",okButton);
          okButton.addActionListener(this);
          setLocation(150,150); // set the location of the dialog box
          setVisible(true); // make the dialog box visible
     } // End Public
     public void actionPerformed(ActionEvent e) { // Begin actionPerformed
//          dispose(); // close dialog box
     } // End actionPerformed
} // End Class
MobileGame
import java.awt.*;
import java.awt.event.*;
class MobileGame extends Panel implements ActionListener { // Begin Class
     The Buttons, Labels, TextFields, TextArea
     and Panels will be created first.
     private int noOfGames;
//     private GameList list;
     private Panel topPanel = new Panel();
     private Panel middlePanel = new Panel();
     private Panel bottomPanel = new Panel();
     private Label saleLabel = new Label ("Java Games For Sale",Label.RIGHT);
     private TextArea saleArea = new TextArea(7, 25);
     private Button addButton = new Button("Add to Basket");
     private TextField add = new TextField(3);
     private Label currentLabel = new Label ("Java Games For Sale",Label.RIGHT);
     private TextArea currentArea = new TextArea(3, 25);
     private Button removeButton = new Button("Remove from Basket");
     private TextField remove = new TextField(3);
     private Button purchaseButton = new Button("Purchase");
     private ObjectList gameList = new ObjectList(20);
     Frame parentFrame; //needed to associate with dialog
     All the above will be added to the interface
     so that they are visible to the user.
     public MobileGame (Frame frameIn) { // Begin Constructor
          parentFrame = frameIn;
          topPanel.add(saleLabel);
          topPanel.add(saleArea);
          topPanel.add(addButton);
          topPanel.add(add);
          middlePanel.add(currentLabel);
          middlePanel.add(currentArea);
          bottomPanel.add(removeButton);
          bottomPanel.add(remove);
          bottomPanel.add(purchaseButton);
          this.add("North", topPanel);
          this.add("Center", middlePanel);
          this.add("South", bottomPanel);
          addButton.addActionListener(this);
          removeButton.addActionListener(this);
          purchaseButton.addActionListener(this);
          The following line of code below is
          needed inorder for the games to be
          loaded into the SaleArea
     } // End Constructor
     All the operations which will be performed are
     going to be written below. This includes the
     Add, Remove and Purchase.
     public void actionPerformed (ActionEvent e) { // Begin actionPerformed
     If the Add to Basket Button is pressed, a
     suitable message will appear to say if the game
     was successfully added or not. If not, an
     ErrorDialog box will appear stateing the error.
          if(e.getSource() == addButton) { // Begin Add to Basket
//          GameFileHandler.readRecords(list);
               try { // Begin Try
                    String gameEntered = add.getText();
                    if (gameEntered.length() == 0 ) {
                         new ErrorDialog (parentFrame,"Feild Blank");
                    } else if (Integer.parseInt(gameEntered)< 0
                              || Integer.parseInt(gameEntered)>noOfGames) { // Begin Else If
                         new ErrorDialog (parentFrame,"Invalid Game Number");
                    } else { // Begin Else If
                         //ADD GAME
                    } // End Else
               } catch (NumberFormatException num) { // Begin Catch
                    new ErrorDialog(parentFrame,"Please enter an Integer only");
               } // End Catch
          } // End Add to Basket
     If the Remove From Basket Button is pressed, a
     a suitable message will appear to say if the
     removal was successful or not. If not, an
     ErrorDialog box will appear stateing the error.
     if(e.getSource() == removeButton) { // Begin Remove from Basket
          try { // Begin Try
                    String gameEntered = remove.getText();
                    if (gameEntered.length() == 0 ) {
                         new ErrorDialog (parentFrame,"Feild Blank");
                    } else if (Integer.parseInt(gameEntered)< 1
                              || Integer.parseInt(gameEntered)>noOfGames) { // Begin Else If
                         new ErrorDialog (parentFrame,"Invalid Game Number");
                    } else { // Begin Else If
                         //ADD GAME CODE
                    } // End Else
               } catch (NumberFormatException num) { // Begin Catch
                    new ErrorDialog(parentFrame,"Please enter an Integer only");
               } // End Catch
          } // End Remove from Basket
     If the purchase button is pressed, the
     following is executed. NOTE: nothing is done
     when the ok button is pressed, the window
     just closes.
          if(e.getSource() == purchaseButton) { // Begin Purchase
               String gameEntered = currentArea.getText();
               if (gameEntered.length() == 0 ) {
                    new ErrorDialog (parentFrame,"Nothing to Purchase");
               } else { // Begin Else If
                    new CreditDialog(parentFrame,"Cost � 00.00. Please enter Credit Card Number");
               } // End Else
          } // End Purchase
     } // End actionPerformed
} // End Class
RunMobileGame
import java.awt.*;
public class RunMobileGame { // Begin Class
     public static void main (String[] args) { // Begin Main
          EasyFrame frame = new EasyFrame();
          frame.setTitle("Game Purchase for 3G Mobile Phone");
          MobileGame purchase = new MobileGame(frame); //need frame for dialog
          frame.setSize(500,300); // sets frame size
          frame.setBackground(Color.lightGray); // sets frame colour
          frame.add(purchase); // adds frame
          frame.setVisible(true); // makes the frame visible
     } // End Main
} // End Class
EasyFrame
import java.awt.*;
import java.awt.event.*;
public class EasyFrame extends Frame implements WindowListener {
public EasyFrame()
addWindowListener(this);
public EasyFrame(String msg)
super(msg);
addWindowListener(this);
public void windowClosing(WindowEvent e)
dispose();
public void windowDeactivated(WindowEvent e)
public void windowActivated(WindowEvent e)
public void windowDeiconified(WindowEvent e)
public void windowIconified(WindowEvent e)
public void windowClosed(WindowEvent e)
System.exit(0);
public void windowOpened(WindowEvent e)
} // end EasyFrame class
ObjectList
class ObjectList
private Object[] object ;
private int total ;
public ObjectList(int sizeIn)
object = new Object[sizeIn];
total = 0;
public boolean add(Object objectIn)
if(!isFull())
object[total] = objectIn;
total++;
return true;
else
return false;
public boolean isEmpty()
if(total==0)
return true;
else
return false;
public boolean isFull()
if(total==object.length)
return true;
else
return false;
public Object getObject(int i)
return object[i-1];
public int getTotal()
return total;
public boolean remove(int numberIn)
// check that a valid index has been supplied
if(numberIn >= 1 && numberIn <= total)
{   // overwrite object by shifting following objects along
for(int i = numberIn-1; i <= total-2; i++)
object[i] = object[i+1];
total--; // Decrement total number of objects
return true;
else // remove was unsuccessful
return false;
ErrorDialog
import java.awt.*;
import java.awt.event.*;
class ErrorDialog extends Dialog implements ActionListener {
private Label errorLabel = new Label("Message space here",Label.CENTER);
private String errorMessage;
private Button okButton = new Button("OK");
public ErrorDialog(Frame frameIn, String message) {
/* call the constructor of Dialog with the associated
frame as a parameter */
super(frameIn);
// add the components to the Dialog
          errorLabel.setText(message);
          add("North",errorLabel);
add("South",okButton);
// add the ActionListener
okButton.addActionListener(this);
/* set the location of the dialogue window, relative to the top
left-hand corner of the frame */
setLocation(100,100);
// use the pack method to automatically size the dialogue window
pack();
// make the dialogue visible
setVisible(true);
/* the actionPerformed method determines what happens
when the okButton is pressed */
public void actionPerformed(ActionEvent e) {
dispose(); // no other possible action!
} // end class
I Know there are alot of files. Any help will be much appreciated. Once again, Many thanks in advance

setSize (600, 200);orpack ();Kind regards,
  Levi
PS:
    int i;
parses to
int i;
, but
[code]    int i;[code[i]]
parses to
    int i;

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