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how to show Jframe before Joptiopane

I tried one code in JoptionPane. I want to show Jframe then need show popup dialog.. I done some research but not get proper answer. major code is as follows
here the code :
Package javaapplication1;
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.JOptionPane;
public class home extends javax.swing.JFrame {
public home() {
initComponents();
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation(dim.width/2-this.getSize().width/2, dim.height/2-this.getSize().height/2);
JOptionPane.showMessageDialog(rootPane,"welcome");
// JOptionPane.showMessageDialog(rootPane,"welcome");
}
}

Simply call setVisible(true) on the JFrame before displaying the JOptionPane. That's it.

How To Add JLabel to Already Existing Jframe?

lol i dont even know if i worded that right
i am a really new programmer and this is my code for the main class:
package culminatingnew;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class CulminatingNew {
public static void main(String[] args) {
Container container = null;
JFrame jframe = new JFrame("Math Adventure");
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setLocationRelativeTo(null);
jframe.setBounds (150, 0, 1000, 1000);
jframe.setBackground(Color.blue);
jframe.setVisible(true);
JLabel labelText = new JLabel("Welcome!");
jframe.getContentPane().add(new CharacterChoose());//
jframe.setVisible(true);
jframe.getContentPane().add(labelText);
jframe.setVisible(true);
So basically, I'm making a game. In another class in the assignment package is CharacterChoose, where the user is greeted with a picture of their character. All I want to do is add text to this same screen saying "Welcome", but whenever I try this it just ignores the CharacterChoose screen and opens a new blank frame that says "Welcome". Is there any way to fix this?

GUI's are not linear/procedural programs, the are event driven, that is, something happens and you respond to it.
Instead, maybe consider using a button saying "Continue" or something, which the user must press, once pressed, you can then present the next view.
I'd recommend having a look at CardLayout for easier management of switching between views.
See How to Use Buttons, Check Boxes, and Radio Buttons, How to Write an Action Listeners and How to Use CardLayout for more details

Fixed sized items in Swing

I am rather new to this whole Swing, but nevertheless it already got me quite annoyed.
I am trying to do something simple, that behaves like WPF's list with custom item template. That is, item are of fixed size and as it overflows the given area a scroll bar pops up.
And I've been trying and trying, but I just can't get it to work. The closest I got was with BoxLayout, the problem there however, is that if there are too few items to take available space, they get stretched -.-
I bet there is some simple way to achieve that, I just don't know about. Thanks in advance.
Here's the code I got (java):
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class App
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
new MainFrame();
}
});
}
}
class MainFrame extends JFrame
{
private JPanel itemsPanel;
private JButton addButton;
public MainFrame()
{
// create components
itemsPanel = new JPanel();
addButton = new JButton("Add");
// layout
itemsPanel.setLayout(new BoxLayout(itemsPanel, BoxLayout.Y_AXIS));
JPanel buttons = new JPanel(new FlowLayout(FlowLayout.LEFT));
buttons.add(addButton);
setLayout(new BorderLayout());
add(new JScrollPane(itemsPanel), BorderLayout.CENTER);
add(buttons, BorderLayout.SOUTH);
// actions
addButton.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent arg0)
{
itemsPanel.add(new SampleItem());
itemsPanel.revalidate();
}
});
// frame size and close action
setDefaultCloseOperation(EXIT_ON_CLOSE);
Dimension size = new Dimension(300, 300);
setMinimumSize(size);
setSize(size);
setVisible(true);
}
}
class SampleItem extends JPanel
{
public SampleItem()
{
setBorder(BorderFactory.createLineBorder(Color.black));
setPreferredSize(new Dimension(200, 100));
}
}
EDIT:
I ended up writing custom renderer and editor thanks to rcook's answer.
EDIT2:
Eh, after turning it in, I got scolded really badly for this... Apparently the problem is that JScrollPane resizes viewport so that the control fills all available space and the solution is to create JPanel implements Scrollable and return false in public boolean getScrollableTracksViewportHeight(). Oh well, I hope someone will find it useful, editors are just so much pain.

Use a JList, put it inside a JScrollPane, put that within a pane in the middle part of a BorderLayout; BorderLayout is the default for a JFrame, so you may not need to create one. Put the lower button on the bottom portion of the BorderLayout.

Why Mainframe JButton appear foreground of JInternalFrame?

I am creating a Swing Application. I have one main JFrame and a JDesktopPane. I added one button and one label on main frame. But if I open any JInternalFrame on Main Frame button and label covers the internal frame.
(JButtonand JLabel appear foreground of JInternalFrame). If I click internal frame button go to background.
Can you help to solve this?
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Point;
import java.awt.Rectangle;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
public class MainFrame {
JFrame frame1 ;
JDesktopPane desktop ;
public MainFrame () {
frame1 = new JFrame("EMPLOYEE LEAVE TRACKER");
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.setExtendedState(Frame.MAXIMIZED_BOTH);
frame1.repaint();
desktop = new JDesktopPane(); //Creates a new JDesktopPane.
frame1.setContentPane(desktop);
frame1.setSize(900,700);
frame1.setVisible(true);
desktop.setBackground(Color.DARK_GRAY );
//Creates a JLabel on JDesktopPane.
JLabel label1 = new JLabel("EMPLOYEE LEAVE TRACKER", SwingConstants.CENTER);
label1.setFont(new Font("SansSerif",Font.ITALIC + Font.BOLD,54));
label1.setBounds(new Rectangle(new Point(275, 100),label1.getPreferredSize()));
//Creates a JButon on JDesktopPane.
JButton Leave = new JButton("Leave Management");
Leave.setHorizontalTextPosition(JButton.CENTER);
Leave.setBounds(new Rectangle(new Point(700,200),Leave.getPreferredSize()));
Leave.setSize(300, 300);
Leave.addActionListener(new java.awt.event.ActionListener() {
#Override
public void actionPerformed(java.awt.event.ActionEvent e) {
frame1.add(LeaveManagment());
}
});
//Look and Feel
try {
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
} catch(Exception e) {
System.out.println("Error setting native LAF: " + e);
}
desktop.add(Leave);
desktop.add(label1);
}
//Creating JInternalFrame
public JInternalFrame LeaveManagment(){
final JInternalFrame employeeFrame = new JInternalFrame("LEAVE M" +
"ANAGEMNT", true, true, true, true);
employeeFrame.getContentPane().setBackground(Color.white);
employeeFrame.setSize(900,700);
employeeFrame.setVisible(true);
employeeFrame.setMaximizable(true);
employeeFrame.setResizable(true);
JComponent c = (JComponent)
employeeFrame.getContentPane();
c.setLayout(new FlowLayout());
return employeeFrame;
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new MainFrame ();
}
});
}}

From the sound of it, you've added the buttons to the JDesktopPane.
The desktop pane is a type of JLayeredPane, this allows you to place components on, we'll, layers.
While this is a neat feature, IMHO, only JInternalFrames and the occasional special "window" should appear on the desktop (although the desktop manager does use a type of button to represent minimised windows)
Personally, I'd place the buttons also where, not on the desktop.
Take a look at How to Use Internal Frames and How to use Layered Pane

MadProgrammer has it right. One solution is to add your components to the appropriate JLayeredPane layer. i.e.,
// Note name change of JButton to adhere to Java naming standards:
desktop.add(leaveManagementBtn, JLayeredPane.DEFAULT_LAYER);
desktop.add(label1, JLayeredPane.DEFAULT_LAYER); // note layer component being added to
and,
public void actionPerformed(java.awt.event.ActionEvent e) {
// again method name capitalization changed to adhere to standard
// again, component added to appropriate layer
frame1.add(leaveManagment(), JLayeredPane.PALETTE_LAYER);
}
Again, MadProgrammer is right, the buttons should not be on the JDesktopFrame but on a button bar off of the desktop. I recommend that you accept his answer.

How to show Modified contents in Applet without resizing

I've created an applet game, but when I modify some of the contents, I need to (maximise or minimise) resize the window to show my modified applet.
even when I add a label, or anything, it needs resizing since I've not used the paint method.(no use of repaint).
Help me with this, how to show modified contents without resizing...
here's a sample code that have same problem.
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
public class Appl extends JApplet implements ActionListener{
Button b = new Button();
public void init()
{
setLayout(new FlowLayout());
setSize(300,300);
setVisible(true);
add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==b)
{
add(new Label("Button clicked"));
repaint();
}
}
}

If I remember correctly you just call the repaint method after the modifications of your content, then it should show up.
Repaint is always implicitly called when you resize the Applet.
Edit: Applying the validate medthod on the Japplet Container works for me in the given example. This also redraws added components, repaint just calls the paint method. try it :-)