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JDesktopPane not displaying any component

I'm experimenting with desktop panes so I can use them in my work projects. The problem here is that I want to use an JInternalFrame within a JDesktopPane, in a normal JPanel it shows normally but cannot move it, using the desktop pane doesn't display any component added.
Here is the code of the last try, is simple just for learning how it works:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Internal_FrameShowtst extends JFrame{
Internal_FrameShowtst(){
BorderLayout bl = new BorderLayout();
JDesktopPane p = new JDesktopPane();
JPanel p1 = new JPanel();
JButton b = new JButton("click");
JInternalFrame in = new JInternalFrame("Test");
Internal_Frametst ift = new Internal_Frametst();
b.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
//p1.add(new JLabel("hola"));
//in.add(p1);
//in.setVisible(true);
ift.setVisible(true);
}
});
p1.add(b);
bl.addLayoutComponent(p,BorderLayout.CENTER);
//p.add(in);
p.add(ift);
p.repaint();
setLayout(bl);
add(p);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new Internal_FrameShowtst().setVisible(true);
}
});
}
}
custom internal frame class:
import javax.swing.*;
public class Internal_Frametst extends JInternalFrame {
Internal_Frametst(){
JPanel p = new JPanel();
JLabel label = new JLabel("Halo");
setIconifiable(true);
//setIcon(true);
setClosable(true);
p.add(label);
p.setSize(300,300);
add(p);
//setVisible(true);
}
}
I've read and tried the following:
Components inside JDesktopPane not showing
JDesktopPane not displaying components when adding JInternalFrame
I've tried adding the components directly, adding a JPanel, adding the internal frame, trying without it, creating the internal frame in the main class, creating my own internal frame in its own class, using layout managers with both panels (normal and desktop), all with the same result.

Your code creates several components that are never added to the visible UI at all. In the version you have posted, the internal frame is invisible and the button to make it visible is not part of the frame. But there are also problems with the initial sizes of the components.
I strongly recommend to keep the creation of a component, the setting of its initial properties, and the code to add it to a parent component close together in your source code.
Further, consider the points discussed in Prefer composition over inheritance? Your subclasses are entirely unnecessary.
Here is a revised version of your code that will open the internal frame when the button is clicked:
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.*;
public class UiExample {
public static void main(String[] args) {
EventQueue.invokeLater(UiExample::initializeUI);
}
static void initializeUI() {
JPanel p1 = new JPanel();
JButton b = new JButton("Show Internal Frame");
p1.add(b);
JInternalFrame ift = initializeInternalFrame();
b.addActionListener(e -> {
ift.pack();
ift.setVisible(true);
});
JDesktopPane p = new JDesktopPane();
p.add(ift);
JFrame mainFrame = new JFrame();
mainFrame.setSize(300, 200);
mainFrame.getContentPane().add(p, BorderLayout.CENTER);
mainFrame.getContentPane().add(p1, BorderLayout.PAGE_START);
mainFrame.setVisible(true);
}
static JInternalFrame initializeInternalFrame() {
JInternalFrame iFrame = new JInternalFrame();
iFrame.setIconifiable(true);
// setIcon(true);
iFrame.setClosable(true);
iFrame.setDefaultCloseOperation(JInternalFrame.HIDE_ON_CLOSE);
JPanel p = new JPanel();
p.add(new JLabel("Hello"));
iFrame.add(p);
return iFrame;
}
}
Note that setDefaultCloseOperation(JInternalFrame.HIDE_ON_CLOSE) is necessary for being able to show the frame again via setVisible(true) after the internal frame has been closed.

How to display one Jframe at a time? [duplicate]

I'm trying to make a little game that will first show the player a simple login screen where they can enter their name (I will need it later to store their game state info), let them pick a difficulty level etc, and will only show the main game screen once the player has clicked the play button. I'd also like to allow the player to navigate to a (hopefully for them rather large) trophy collection, likewise in what will appear to them to be a new screen.
So far I have a main game window with a grid layout and a game in it that works (Yay for me!). Now I want to add the above functionality.
How do I go about doing this? I don't think I want to go the multiple JFrame route as I only want one icon visible in the taskbar at a time (or would setting their visibility to false effect the icon too?) Do I instead make and destroy layouts or panels or something like that?
What are my options? How can I control what content is being displayed? Especially given my newbie skills?

A simple modal dialog such as a JDialog should work well here. The main GUI which will likely be a JFrame can be invisible when the dialog is called, and then set to visible (assuming that the log-on was successful) once the dialog completes. If the dialog is modal, you'll know exactly when the user has closed the dialog as the code will continue right after the line where you call setVisible(true) on the dialog. Note that the GUI held by a JDialog can be every bit as complex and rich as that held by a JFrame.
Another option is to use one GUI/JFrame but swap views (JPanels) in the main GUI via a CardLayout. This could work quite well and is easy to implement. Check out the CardLayout tutorial for more.
Oh, and welcome to stackoverflow.com!

Here is an example of a Login Dialog as #HovercraftFullOfEels suggested.
Username: stackoverflow Password: stackoverflow
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import javax.swing.*;
public class TestFrame extends JFrame {
private PassWordDialog passDialog;
public TestFrame() {
passDialog = new PassWordDialog(this, true);
passDialog.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new TestFrame();
frame.getContentPane().setBackground(Color.BLACK);
frame.setTitle("Logged In");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
}
});
}
}
class PassWordDialog extends JDialog {
private final JLabel jlblUsername = new JLabel("Username");
private final JLabel jlblPassword = new JLabel("Password");
private final JTextField jtfUsername = new JTextField(15);
private final JPasswordField jpfPassword = new JPasswordField();
private final JButton jbtOk = new JButton("Login");
private final JButton jbtCancel = new JButton("Cancel");
private final JLabel jlblStatus = new JLabel(" ");
public PassWordDialog() {
this(null, true);
}
public PassWordDialog(final JFrame parent, boolean modal) {
super(parent, modal);
JPanel p3 = new JPanel(new GridLayout(2, 1));
p3.add(jlblUsername);
p3.add(jlblPassword);
JPanel p4 = new JPanel(new GridLayout(2, 1));
p4.add(jtfUsername);
p4.add(jpfPassword);
JPanel p1 = new JPanel();
p1.add(p3);
p1.add(p4);
JPanel p2 = new JPanel();
p2.add(jbtOk);
p2.add(jbtCancel);
JPanel p5 = new JPanel(new BorderLayout());
p5.add(p2, BorderLayout.CENTER);
p5.add(jlblStatus, BorderLayout.NORTH);
jlblStatus.setForeground(Color.RED);
jlblStatus.setHorizontalAlignment(SwingConstants.CENTER);
setLayout(new BorderLayout());
add(p1, BorderLayout.CENTER);
add(p5, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
jbtOk.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (Arrays.equals("stackoverflow".toCharArray(), jpfPassword.getPassword())
&& "stackoverflow".equals(jtfUsername.getText())) {
parent.setVisible(true);
setVisible(false);
} else {
jlblStatus.setText("Invalid username or password");
}
}
});
jbtCancel.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
setVisible(false);
parent.dispose();
System.exit(0);
}
});
}
}

I suggest you insert the following code:
JFrame f = new JFrame();
JTextField text = new JTextField(15); //the 15 sets the size of the text field
JPanel p = new JPanel();
JButton b = new JButton("Login");
f.add(p); //so you can add more stuff to the JFrame
f.setSize(250,150);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Insert that when you want to add the stuff in. Next we will add all the stuff to the JPanel:
p.add(text);
p.add(b);
Now we add the ActionListeners to make the JButtons to work:
b.addActionListener(this);
public void actionPerforemed(ActionEvent e)
{
//Get the text of the JTextField
String TEXT = text.getText();
}
Don't forget to import the following if you haven't already:
import java.awt.event*;
import java.awt.*; //Just in case we need it
import java.x.swing.*;
I hope everything i said makes sense, because sometimes i don't (especially when I'm talking coding/Java) All the importing (if you didn't know) goes at the top of your code.

Instead of adding the game directly to JFrame, you can add your content to JPanel (let's call it GamePanel) and add this panel to the frame. Do the same thing for login screen: add all content to JPanel (LoginPanel) and add it to frame. When your game will start, you should do the following:
Add LoginPanel to frame
Get user input and load it's details
Add GamePanel and destroy LoginPanel (since it will be quite fast to re-create new one, so you don't need to keep it memory).

Java - How to make contents of JFrame appear in the same Window instead of multiple windows

I am new to java and am getting to the advanced level of it, i have a problem in the GUI Controls, i made a button that when clicked opens up a new window like this:
JButton b = new JButton("Open New Window");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Window w = new Window();
w.setVisible(true);
}
});
this window contains other objects but i have been thinking of making the button in such a way that instead of opening a new JFrame, it opens everything in that same window without opening a new window, honestly i dont know how to do so please could i get some professional help

I think you want a card layout for this situation. Here is some code which should point you in the right direction.
class MyFrame extends JFrame {
public MyFrame() {
JComponent allMyStuff = new JComponent();
JComponent allMyOtherStuff = new JComponent();
this.getContentPane().setLayout(new CardLayout());
this.getContentPane().add(allMyStuff, "1");
this.getContentPane().add(allMyOtherStuff, "2");
CardLayout cl = (CardLayout) (this.getContentPane().getLayout());
cl.show(this.getContentPane(), "1");
JButton b = new JButton("Open New Window"); //add somewhere to first compoonent
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
CardLayout cl = (CardLayout) (this.getContentPane().getLayout());
cl.show(this.getContentPane(), "2");
}
});
}
}
I doubt the code runs but generally it holds the idea. You have stuff in one panel, and stuff in another panel, and you just want to switch between the two. The button of course needs to be added in the first panel (allMyStuff) somewhere.

I"m not clear on what it is exactly that you want to show in the GUI when the button is pressed, but perhaps you should consider creating different JPanel "views" and swap these views in the GUI using a CardLayout.
For example, check out these StackOverflow questions and answers:
Java CardLayout Main Menu Problem
Change size of JPanel using CardLayout
Java CardLayout JPanel moves up, when second JPanel added
Java swing; How to toggle panel's visibility?
Clear components of JFrame and add new componets on the same JFrame
gui multiple frames switch
JLabel displaying countdown, java

Within the action listener that you have introduced, you have the possibility to access to instance variables. Therefore you can add further elements to your GUI if you want. I've done a small demo, maybe this is kind of, what you want to do. In order to make your GUI better, you should consider of using layout managers.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class GUI {
JFrame frame;
JButton btn;
JButton compToAdd;
public GUI() {
frame = new JFrame("Testwindow");
frame.setSize(500, 500);
frame.setLayout(null);
btn = new JButton("test btn");
btn.setBounds(20, 20, 200, 200);
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
compToAdd = new JButton("new Button");
compToAdd.setBounds(20, 220, 200, 200);
frame.add(compToAdd);
frame.repaint();
}
});
frame.add(btn);
frame.setVisible(true);
}
public static void main(String[] args) {
GUI gui = new GUI();
}
}

Java: How to add a button to a frame?

I try to just use a add.method to add a button to a frame. But only the frame pops up.
I don't see any buttons.
import javax.swing.*;
public class okd {
public static void main() {
JFrame frame = new JFrame();
JButton b1 = new JButton();
frame.setSize(500,500);
frame.add(b1);
b1.setSize(400,400);
b1.setVisible(true);
frame.setVisible(true);
}
}

There is a button there. Add some text to it and it will magically appear.
public static void main(String[] args){
JFrame frame = new JFrame();
JButton b1 = new JButton();
frame.setSize(500,500);
b1.setSize(400,400);
b1.setVisible(true);
b1.setText("HelloWorld");
frame.add(b1);
frame.setVisible(true);
}//SSCCE1

Your button has been added to the frame. You'll notice a difference if you remove your frame.add() line. The 'problem' lies with the following.
You haven't specified a layout resulting in your frame using the
default BorderLayout manager.
You haven't specified a constraint in frame.add(). Because of this the
component has been added to whatever the default position is for the
layout which is BorderLayout.CENTER. Components added to the center
take up the much space as possible hence why your button is filling the entire frame.
Here's some tutorials on layout managers. You might want to have a read through these at some point.

To remove the Large appearance of the button, You need to add a layout Manager to the Code
Like this:
import javax.swing.*;
import java.awt.*;
public static void main(String[] args)
{
JFrame frame = new JFrame();
JButton b1 = new JButton();
frame.setSize(500,500);
b1.setVisible(true);
b1.setText("HelloWorld");
frame.setLayout(new FlowLayout());
frame.add(b1);
frame.setVisible(true);
}

JTabbedPane shows itself randomly

the problem I encountered is weird for me, because I was doing everything step by step, correctly (in my opinion) and finally when I could say I finished one part of my program it appeared to make a fun of me. The actual problem is that in GUI I created I used a JPanel, then I've put it into a JTabbedPane which I've finally put into a JFrame. Everything is fine and works apart from times when it doesn't. I know it sounds strange, but after running program once I get what I wanted (Frame with tabbed pane containing panel with some stuff in it) and then when I run it again it either show the correct thing again or just empty frame. The worst thing is that it's so random, I haven't got a clue what can be wrong, I don't even know what exactly should I google to find it out. The code is:
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.*;
public class GUI extends JFrame {
JFrame frame = new JFrame("WakeOnLan script generator");
JPanel panel1 = new JPanel(null);
JTextArea text; //= new JTextArea("test");
JScrollPane scroll = new JScrollPane();
JButton but = new JButton("test");
JTabbedPane tab = new JTabbedPane();
public GUI() {
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
int w = frame.getSize().width;
int h = frame.getSize().height;
int x = (dim.width-w)/3;
int y = (dim.height-h)/4;
frame.setSize(500,500);
frame.setLocation(x,y);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setLayout(null);
createTab1();
tab.addTab("Tab 1", panel1);
tab.setVisible(true);
tab.setBounds(0, 0, 500, 500);
frame.add(tab);
}
public void createTab1(){
text = new JTextArea("test");
text.setVisible(true);
scroll.setViewportView(text);
scroll.setBounds(10,10,465,300);
panel1.setLayout(null);
panel1.add(scroll);
panel1.setVisible(true);
panel1.setSize(500,500);
//panel.setBackground(Color.blue);
}
}
And then I just run it in the main method in other class:
public class GUIStarter {
public static void main(String[] args) {
GUI start = new GUI();
}
}
So could anyone give me an answer or just a hint?
Thank you.

You should call frame.setVisible(true) after adding all your components to your JFrame. So try moving it to the end of your constructor.
Alternatively, you can call frame.validate() after all the components have been added.