Develop Reference

My Jpanels keep sinking when I go to them

In my program I go from the log in to the main menu,to different areas of the site.
jPanel2.removeAll();
Items panel = new Items();
jPanel2.add(panel);
jPanel2.repaint();
jPanel2.revalidate();
I thought that I found a way to change jpanels so that I can go from one jpanel to another which in the same screen.
The problem with the above code is that each time I change jpanels, the old jpanel isn't gotten rid of, it is staying there, meaning whenever I change jpanels the jpanel slowly gets lower on the page due to it being put underneath the other jpanels that were created before it.
Is there a way to get rid of the jpanels so that when I go to a new jpanel it doesn't slowly lower down the page?

I think you should use CardLayout to achieve this requirement.
Check this below link.
https://docs.oracle.com/javase/tutorial/uiswing/layout/card.html
or this SO
Changing Panels using the Card layout

Java JPanel Layout

Im new in Java Swing, and want to make my layout, but can't do this
Look Now :
Look I want :
Code Now :
JPanel MainPanel = new JPanel(new GridBagLayout());
JLabel MoneyLabel = new JLabel(MoneyIcon);
MoneyLabel.setHorizontalTextPosition(JLabel.CENTER);
MoneyLabel.setVerticalTextPosition(JLabel.BOTTOM);
MoneyLabel.setText("Money:" + CarMain.Money);
JLabel MoneyClicksLabel = new JLabel();
MoneyClicksLabel.setHorizontalTextPosition(JLabel.CENTER);
MoneyClicksLabel.setVerticalTextPosition(JLabel.BOTTOM);
MoneyClicksLabel.setText("Money Clicks: " + CarMain.MoneyClicks);
JLabel BoxesLabel = new JLabel(BoxLv9_10Icon);
BoxesLabel.setHorizontalTextPosition(JLabel.CENTER);
BoxesLabel.setVerticalTextPosition(JLabel.BOTTOM);
BoxesLabel.setText("Boxes: " + CarMain.Boxes);
JLabel BoxesClicksLabel = new JLabel();
BoxesClicksLabel.setHorizontalTextPosition(JLabel.CENTER);
BoxesClicksLabel.setVerticalTextPosition(JLabel.BOTTOM);
BoxesClicksLabel.setText("Boxes Clicks: " + CarMain.BoxesClicks);
MainPanel.add(MoneyLabel);
MainPanel.add(MoneyClicksLabel);
MainPanel.add(jbtnMoney);
MainPanel.add(BoxesLabel);
MainPanel.add(BoxesClicksLabel);
MainPanel.add(jbtnBoxes);
This is simple example of, what i want, becouse i'm building ingame shop, with 13 labels like these, in each tabbedpane window. How can i make it look, like in second picture, what I want?

Im new in Java Swing, and want to make my layout, but can't do this
Probably no single layout can suit everyone's needs. But combining several layouts can usually handle most scenarios.
From the image you showed in the question. There is no need to write your own layout. You can always use sub panels to hold your components and set a specific layout for each sub panel to handle what you need for those individual areas.
The reason for the alignment in your first attached image is because:
JPanel uses FlowLayout as its default layout. Hence all the components added will appear in a linear fashion and tries to fill up the row as much as possible the panel's width can hold. Once exceeded the panel's width, the components will be pushed to the next row.
If you want to achieve the alignment in the second attached image:
You may create a main panel to contain several sub-panels (see image below).
The red box is your main panel and you may continue to use the default FlowLayout.
Then add your components into sub-panels (orange boxes) before adding it to the main. You may then use BoxLayout, FlowLayout or even GridBagLayout for the sub panels (orange boxes).

Artis Uljanovs, at night after work i will give a look at this to help you.
I recommend you already to read the following: https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
You need some foundations on Java Layouts.

Dynamically resize images linked to JLabels in a GridLayout layoutmanager

Current implementation layout:
((EDIT: added
Code: ))
private JPanel panelCenter;
private List<BufferedImage> listCreatedImages;
public ChooseCircuitPanel(List<BufferedImage> listCreatedImages) {
this.listCreatedImages = listCreatedImages;
initiate();
}
private void initiate() {
setLayout(new BorderLayout(50, 50));
panelCenter = new JPanel();
LayoutManager theLayout = new GridLayout(0, 3, 0, 0);
panelCenter.setLayout(theLayout);
panelCenter.setBorder(BorderFactory.createLineBorder(Color.BLACK));
for (BufferedImage bufferedImage : listCreatedImages) {
ImageIcon theImage = new ImageIcon(bufferedImage);
JLabel lblForImage = new JLabel(theImage);
lblForImage.setBorder(BorderFactory.createLineBorder(Color.BLACK));
panelCenter.add(lblForImage);
}
this.add(panelCenter, BorderLayout.CENTER);
}
Situation:
We want to display a race circuit here. A circuit should be displayed by placing standards tiles next to each other. It should be possible to resize the window, and with that, the circuit tiles should also resize.
((EDIT: bit more info: The race circuit data is stored on a server and the desktop application has to translate the data to a visual thing, by placing some standard tiles in the right order. ))
((EDIT: we are not allowed to use any external library. It should be doable by only using Java Swing code.))
I thought about placing the images in a JLabel and placing these JLabels in a panel with GridLayout as layout manager.
Using a GridLayout - I thought - it should be rather easy to get to a solution:
the components in the GridLayout (= JLabels) already scale and do exactly what I want.
Now, it would only be a matter of finding a way to resize the images so they fill the JLabels.
As you can see: right now, the images have a fixed size and don't scale at all.
I browsed a bit and saw lots of solutions that boil down to using Graphics2D and super.paintComponent, etc.
But most of these solutions had nothing to do with a GridLayout.
So conclusive question:
Is there an easier solution aside from using Graphics2D, etc. knowing that I use a GridLayout?
If not, I will of course use Graphics2D, etc. but I'm now just exploring my options. :)
((EDIT: SOLVED The tiles now neatly fit on each other. Don't mind the misalignments, that's our fault.))

There are no Swing components that do what you want so you will need to write your own code.
The easiest approach would be to use Darryl's Stretch Icon on your JLabel.
Or another approach is to create your own custom component that dynamically scales the image as it is painted. Something like the Background Panel which has code that allows you to scale or tile an image.

Given the nature of the view, I would recommend abandoning images altogether and instead implement the rendering in an Icon. Presuming you can make an icon scale with the label.

How do I put JPanel on another JPanel?

I am new to the java (and programming in general) and I am trying to make my very first program. I'm stuck on the same problem for about 5 hours now, so I've decided to ask for help.
Basically I'm trying to make a program (2d game) that has about 20 positions on the board. Each position is either blue (owned by player1), red(owned by player2) or black(not owned by anyone).
The way I'm going about this is in main I've put a method that calls setup game, and then a method that plays game. I am working on the setup game, basically all it does is it makes an object of class Background (extends JPanel, and overrides paintComponent()) and 20 objects of class Position(extends JPanel, and overrides paintComponent()).
So far I'm stuck on putting those Position objects on top of Background object.
When I do:
Background background= new Background();
frame.getContentPane().add(background);
Position position1= new Position;
frame.getContentPane().add(position1);
frame.setVisible(true);
it shows only a circle and no background as I was hoping, if I first add position and then background, I only have background and no circle.
Anyway I'm new to the java and I am still having trouble founding my way around, however I've tried to search for solutions, and I've found many different solutions to this problem (such as adding position to background first, and then adding background to frame, etc.) but I couldn't make any of them to work.
I am aware that the way I am adding them both to frame is (very likely) completely wrong, but I wrote it that way so you would (hopefully) be sure that what I've wrote actually does show you that my code for each of those classes draws something on the screen.
PS: I didn't copy my code here as most of variable and method names aren't in English so it's fairly hard to read, but if you still think its needed, I will add it. Also I'm sorry for my probably stupid question, but I'm kinda hitting a wall here and I've no idea what else to try.

Basically I'm trying to make a program (2d game) that has about 20
positions on the board. Each position is either blue (owned by
player1), red(owned by player2) or black(not owned by anyone).
Painting in Swing by default never returns PreferredSize, is required to override getPreferedSize()
JPanel has implemented FlowLayout in API, this LayoutManager accepting only PreferredSize came from JComponents added to this container
after a.m. changes to post an SSCCE, short, runnable, compilable

Background background= new Background();
frame.getContentPane().add(background);
Position position1= new Position;
frame.getContentPane().add(position1);
A JFrame uses a BorderLayout by default. Also by default when you add a component to a Container that uses a BorderLayout the comopnent is added to the CENTER. Only one comonent can be added to the CENTER so your Position comonent replaces the Background component.
You want to add the Position to the Background and then add the Background to the frame. Something like:
Background background= new Background();
Position position1= new Position;
background.add(position1);
frame.add(background);
Note: there is no need to uses getContentPane() when adding a component to the frame.

The root panel should be a JFrame with a Container class underneath. When you call someRoot.window.container = yourJPanel, that loads the JPanel as the main component view of the JFrame. Note, a JFrame can only hold one JPanel but other JPanels can hold other JPanels. Just as you add the initial JPanel to the JFRam, a JPanel's own container can be another JPanel. Hope this helps.
Like this:
JPanel temp = new JPAnel();
frame.getContentPane().add(temp);
temp.getContentPane().add(new JPanel());
After these additions, there is a command that is illuding me but you call on JFrame to get it to refresh in real time. I think it is something like:
frame.validate(); //thanks #SMT
or something,

Try using something like
jPanelExampleName.validate();
jPanelExampleName.repaint();
after adding your JPanels.

It sounds like you want to use one JFrame and attach JPanels to it. This is how I personally would do it.
Declare your JFrame and JPanels
JFrame frame1 = new JFrame( "App Name");
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
Set the Background (I'm using colors but you get the idea)
panel1.setBackground(Color.orange);
panel2.setBackground(Color.orange);
panel3.setBackground(Color.orange);
panel4.setBackground(Color.orange);
Set your layout for the JFrame (I'm using BoxLayout not sure which would be best for you) You can find the best one for you and some sample code here. Also just set the default close operation.
frame1.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame1.setLayout( new BoxLayout( frame1.getContentPane(), BoxLayout.Y_AXIS ) );
Then Just attach your JPanels
frame1.add( panel1);
frame1.add( panel2);
frame1.add( panel3);
frame1.add( panel4);
frame1.pack();
frame1.setVisible( true );
This will allow you to use the JPanels you created and then change the colors via other methods.

How to move around on a map with mouse and/or keys (RTS-like game)

As the title suggests, I'm making a game where there is a map, the map is of course bigger than could fit on the screen as most RTS games :)
So, any suggestions on how to go about this?
The map is a big JFrame with images drawn on it.

I highly doubt drawing the WHOLE map in memory and just choosing the part to display is scalable. You want to only draw what the user sees instead, in window-coordinates.

I don't know how big your map is, but you could add the map to a JScrollPane. Hide the vertical/horizontal scrollbars. Then you can position the map by using the viewport of the scrollpane.

Now I changed my map (former JFrame) to a JPanel, adding it to a JScrollPane that is added to the contentPane of the JFrame, see code below:
public Main() //extends JFrame
{
setDefaultCloseOperation(this.EXIT_ON_CLOSE);
Board b = new Board(db); //extends JPanel
setSize(400, 200); //size of the JFrame, JPanels size is set in its own constructor
jsp = new JScrollPane(b); //adding the Board to the JScrollPane
getContentPane().add(jsp); //adding the JScrollPane to the contentPane
setVisible(true);
}
Now what happens is the Board shows up, with all cells at the right places, I can interact with the map as usual, but no scrolling to be seen anywhere.
Pointers or solution?
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