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Issue with JScrollPane + JTree display after having it initialized

I have a simple swing App, that can manage a specific type of project with multiple JButton and that print the project tree on the bottom, see the screenshoot bellow when a project is opened in the App :
App screenshoot with project opened
The thing is when no project is opened I get something like this :
App screenshoot without project opened
The HMI is simple and looks like this :
public class Desktop extends JFrame implements ActionListener {
public Desktop() {
JButton newProject, generate, quit, bAddToClassPath, openProject, saveProject;
JPanel mainPanel;
JScrollPane jscrollpane;
super("MainWindow");
setLookAndFeel();
setSize(330, 440);
ParamMainPanel();
setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Desktop();
}
});
}
public static void ParamMainPanel() {
mainPanel = new JPanel(new FlowLayout());
// BUTTONS PARAM
newProject = new JButton("Nouveau projet");
generate = new JButton("Générer...");
quit = new JButton("Quitter");
openProject = new JButton ("Ouvrir projet");
saveProject = new JButton ("Sauvegarder");
bAddToClassPath = UIUtil.iconButton();
bAddToClassPath.setActionCommand("setCP");
bAddToClassPath.addActionListener(this);
mainPanel.add(bAddToClassPath);
newProject.addActionListener(this);
newProject.setActionCommand("newP");
generate.addActionListener(this);
generate.setActionCommand("gen");
quit.addActionListener(this);
quit.setActionCommand("qui");
openProject.addActionListener(this);
openProject.setActionCommand("openP");
saveProject.addActionListener(this);
saveProject.setActionCommand("save");
mainPanel.add(newProject);
mainPanel.add(generate);
mainPanel.add(openProject);
mainPanel.add(saveProject);
mainPanel.add(quit);
// PROJECT TREE
jscrollpane = new JScrollPane(new JTree());
jscrollpane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
jscrollpane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
jscrollpane.setMinimumSize(new Dimension(50, 50));
jscrollpane.setLocation(4,61);
jscrollpane.setSize(306,322);
mainPanel.add(jscrollpane);
}
}
So what I want is at the App launch, instead of having the bad looking display JTree (into the jscrollpane) without project opened, having the same display with a project opened (white bloc) but without the project tree inside.
I can't figure how to do it, any ideas ?

Here the answer I found to resolve this display problem :
The FlowLayout used on my main panel somehow was preventing me from resizing my jscrollpane directly using setSize()
So I decided to have a secondary panel on my MainFrame secondMainPanel without specific layout using new JPanel(null);
I did add jscrollpaneon it, then I could resize it without problems to have a correct display.
I think there might be better way to fix it, but this one works.

Text not displayed when mouse is rolled over JLabel

With NetBeans (Java), I am having problems in JLabel. I have assigned an image as the icon of that JLabel.
Problem - 1st:
I want to display some text (e.g - logout) below that icon (image). How to do this?
Problem - 2nd:
I want to display some text when mouse is rolled over that JLabel. What should I do?
So , please guys tell me how to these things by writing code.

I recommend reading the basic Oracle tutorials which describe in detail how to accomplish this. You can use a MouseMotionListener to determine when the mouse is rolled over the JLabel, and you can position the JLabel text underneath the Icon of the JLabel by setting its vertical text position as described in the JLabel Tutorial. This should have all been found with a simple internet search of your questions, something that your question suggests was not done (and should have been) before asking

1.
Create a JPanel that contains two JLabels. This way you can control the layout of the internal components.
I used BoxLayout with the parameter BoxLayout.Y_AXIS to get the label below the icon.
2.
Add a MouseListener using the method component.addMouseListener(new MouseAdapter() { ... });, you'll need to create a MouseAdapter and implement any methods you need (click here).
Here is a working example for you buddy... Adapt this however you need to.
Note: You'll need to change the file-path of the ImageIcon()
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel container = new JPanel();
JPanel iconLabelPanel = new JPanel();
String TEXT_FIELD_TEXT = "Hover over the logout label.";
JLabel icon = new JLabel(new ImageIcon("C:\\Users\\Gary\\Google Drive\\Pictures\\puush\\ss (2015-02-19 at 06.00.00).png"));
JLabel label = new JLabel("Logout!");
JTextField textField = new JTextField(TEXT_FIELD_TEXT);
//Add a mouse motion listener for the JLabel
label.addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
//Set text of another component
textField.setText("You're over Logout!");
}
#Override
public void mouseExited(MouseEvent e) {
//Set text of another component
textField.setText(TEXT_FIELD_TEXT);
}
});
//Add components and set parameters for iconLabelPanel
iconLabelPanel.setLayout(new BoxLayout(iconLabelPanel, BoxLayout.PAGE_AXIS));
iconLabelPanel.add(icon);
iconLabelPanel.add(label);
//Add components and set parameters for container
container.setLayout(new BoxLayout(container, BoxLayout.PAGE_AXIS));
container.add(iconLabelPanel);
container.add(textField);
//Set parameters for frame
frame.add(container);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(400, 400);
frame.setVisible(true);
}

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();
}
}

JButton and jgraphx wont show up at the same time

I have tried several ways, but still havent found the solution. I have a jgraph in a frame and I want to add a Jbutton in that frame also in a specific location. However I only get one of them when i run the program, because they expand to the whole window. Any ideas how to fix this?
Thanks in advance.
public class GUIquery extends JFrame {
JFrame frame;
static JGraph jgraph;
final mxGraph graph = new mxGraph();
final mxGraphComponent graphComponent = new mxGraphComponent(graph);
public GUIquery() {
super("Test");
GraphD();
imgbtn();
}
public void GraphD() {
Object parent = graph.getDefaultParent();
graph.getModel().beginUpdate();
try {
........
}catch {
........
} finally {
graph.getModel().endUpdate();
}
getContentPane().add(graphComponent);
}
public void imgbtn() {
JPanel jpanel = new JPanel();
jpanel.setSize(100, 100);
jpanel.setLocation(1200, 60);
JButton imgbtn = new JButton("Export as Image");
imgbtn.setSize(100, 100);
imgbtn.setLocation(1200, 60);
jpanel.add(imgbtn);
add(jpanel);
}
public static void main(String[] args) {
GUIquery frame = new GUIquery();
frame.setLayout(null);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 320);
frame.setVisible(true);
}
}

Don't use null layouts. They inevitably result in trouble.
From your code snippet it is impossible to tell where you want them to be relative to each other, the following puts the button below the graph.
The content pane uses BorderLayout by default. For BorderLayout, you need to use place components at different positions:
// the default position, but it does not hurt to be explicit
add(graph, BorderLayout.CENTER);
...
// and the panel
add(jpanel, BorderLayout.SOUTH);
If the positioning is not what you want, take a look at the visual guide to layout managers to pick the layout manager that suits your needs best.
In the button panel the setLocation() and setSize() calls are useless. The layout manager of the panel is responsible for setting the button's bounds. If the default FlowLayout is not what you want for it, use the guide to pick another for the panel too.

Java GUI - JPanels, JFrames, JButtons

I'm trying to open a window that has both an image and buttons in it. But I can't seem to figure out how to add the button. The image displays great and the menu works fine, but no matter where I add the button (into the JLabel, JPanel, or JFrame), it doesn't ever show...
Main:
public static void main(String[] args) {
GUI myGUI = new GUI();
myGUI.show();
}
GUI class: openImage is called when using the menu. The image then displays, but no button.
private JFrame myFrame;
private JPanel myPanel;
private JLabel myLabel;
public GUI()
{
myFrame = new JFrame();
initializePanel();
}
public void show()
{
myFrame.setSize(600,600);
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.addMouseListener(this);
setupMenu(myFrame);
myFrame.setVisible(true);
}
private void initializePanel()
{
myPanel = new JPanel();
myPanel.setPreferredSize(new Dimension(500,500));
//myPanel.setLayout(new BorderLayout());
}
private void openImage(String fileName)
{
try {
myImage = ImageIO.read(new File(fileName));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
myLabel = getJLabel();
JButton button = new JButton("ButtonClick");
button.addActionListener(this);
myFrame.setContentPane(myLabel);
myPanel.add(button);
myFrame.getContentPane().add(myPanel);
myFrame.pack();
myFrame.setSize(600,600);
}
private void setupMenu(JFrame window) {
JMenuBar menubar = new JMenuBar();
JMenu file = new JMenu("File");
JMenuItem open = new JMenuItem("Open");
open.addActionListener(this);
file.add(open);
menubar.add(file);
window.setJMenuBar(menubar);
}

Your main issue is your setting the contentPane to be a JLabel -- don't do this! The contentPane needs to be opaque, needs to be built to be easily used as a Container and in your case, really should be a JPanel. JLabel I believe uses a null layout so it's no surprise that your code shows no button. If you want to show a background image, make have myPanel constructed from an anonymous class that extends JPanel, override the paintComponent method in this class (calling super.paintComonent first in the method), and draw the image in this method. Then you can add components to the contentPane which will now use a FlowLayout (the default for a JPanel) and it will be opaque by default.
Also, if your goal is to swap items displayed in your GUI, use a CardLayout to do the swapping for you as this layout makes swapping components a breeze.

really don't know, depends of method(s) how you are added picture to the JLabel, JPanel, or JFrame, but maybe for simle Container that contains a few, only one-two JComponents is there crazy idea, without side effects, with idea to display picture and to add there JButton:
JLabel is very similair JComponent to the JPanel, and is by default translucent and very simple implements Icon/ImageIcon, then you'll only to call myLabel.setIcon(myPicture)
to the all of JComponents you are/could be able to add another JComponent by using some of LayoutManager (Box, Flow, GridBagLayout)

You tried to set the label as the content pane and then tried to add the panel to that image which doesn't make sanse at all.
Change it so you add the label to the panel and have the panel as content pane:
Like this:

You have this line which is the problem. It doesn't make much sense:
myFrame.setContentPane(myLabel);
Try instead:
myFrame.getContentPane().add(myLabel);