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Background image not viisible in JFrame [duplicate]

Having a issue trying to display my logo. The picture is saved in the same folder as main.java
ImageIcon im = new ImageIcon("banner.png");
JLabel bam = new JLabel(im);
grid.add(bam);
Is there a problem in my syntax?

There are any number of possible issues, but the likely one is, the location of the image is not within the same context as where the application is being executed from.
Let's say, main.java lives in some directory (lets just say "path/to/class" for argument sake), then when you execute you main.java, the path to the images would become something like /path/to/class, meaning you should be using using something like...
ImageIcon im = new ImageIcon("path/to/class/banner.png");
This also assumes that the image hasn't being Jar'ed yet, as ImageIcon(String) expects a path to a file on the file system.
If the program has being Jar'ed then you won't be able use ImageIcon(String), as the banner.png is no longer a file, but a resource, then you would need to use something like...
ImageIcon im = new ImageIcon(getClass().getResource("/path/to/class/banner.png"));
Where /path/to/class is the package where main.java lives.
In either case, I would recommend that you use ImageIO.read instead, as this will actually throw an IOException when something goes wrong, where ImageIcon tends to fail silently...
Take a look at Reading/Loading an Image for more details

Try ImageIcon im = new ImageIcon(new File("banner.png")); If you're using eclipse, put it in the root folder, not the src folder. The root folder has the src folder and the bin folder.

If you create a folder called images (or whatever name you prefer) in your source directory, and then place the banner.png file in that folder you can then use the following code.
ImageIcon im = new ImageIcon(this.getClass().getResource("/images/banner.png"));

I know this is an old post, but I had the same issue on my project and fixed it by giving the full path in the ImageIcon definition, instead of just the path from the project. I.e.
ImageIcon im = new ImageIcon("C:/your/image/file/path/banner.png);
It solved the issue for me, but I do recognise that this is not a valid long-term solution, since it will only work on the developer's machine and I'm not sure if portability would be an issue.
Hope I have helped somebody.

There's a lot of things that could be going on here and it's hard to tell without more code. Based on the short snippet above (and assuming everything else is correct) you should check the image load status of the ImageIcon using the getImageLoadStatus() method. If it returns MediaTracker.COMPLETE then you're good to go and the error is somewhere outside this code. If it's anything but COMPLETE then you are having some sort of issue in loading the image. Maybe it's not in the path or classpath?

How to make an icon appear invisible without using a clear picture

I am making a program but the default Java icon looks really ugly, i want it so that the icon is clear without using any clear pictures, I'm using this code
f.setIconImage(new ImageIcon("pic.png").getImage());
so is there a way to do it? Or do i have to stick with a clear image?

Null layout at Netbeans

*SOLVED:I made a Jframe with a specific background that I need. I found on Youtube that if I want to have a picture for background,you have to choose Null Layout.I did it,and when I run my program then the window remains small(not at normal size) at left corner on my screen. I need Null Layout because I use other labels up to Label,which I use as background.I have almost done with my project,and I have only this problem.Any idea?
Thank you!
**I found the solution. You can choose Absolute Layout and it has no problem !!!

Adding icon to my application issues

I want to change the icon of my application. system.gif is in current directory. getDefaultToolkit() is not working. getToolkit() is working but another minimized window is also open. Other components are Swing components.
Toolkit theKit = jtfMainFrame.getDefaultToolkit();
Image icon = theKit.getImage("system.gif");

To get an icon for an app.
Add it to the Jar and use Class.getResource("/system.gif") to obtain an URL to it. File objects will generally not work for such an 'application resource'.
To load the image, use ImageIO.read(URL). This is a blocking method that will ensure the image is entirely loaded before proceeding. It will also throw informative exceptions if anything goes wrong.

An easier alternative to JFrames (in full screen)?

Right now, I have a full screen application which spawns several full screen JFrames based on a configuration file (so I can never predict exactly how many frames I will have). These JFrames are in full-screen mode, like this:
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
setUndecorated(true);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(0,0,screenSize.width, screenSize.height);
The problem is, these JFrames are misbehaving in a Linux environment. I struggled a whole lot with requestFocus, requestFocusInWindow, toFront, setVisible, etc. But nothing seems to get it to work properly in Linux. The issue lies in the fact that I have several frames and I need to be able to switch between them when I click on a button (it's basically a menu).
So I'm starting to think a JFrame isn't the best object to use. Would it be easier to manager multiple frames if they were, say optionPanes? Or something similar? Whatever the solution, I need to be able to DO_NOTHING_ON_CLOSE and setUndecorated (or something similar).
Note: If you don't see a reason I need to change my JFrame and would know how I can switch focus/view easily, please let me know. This would also be an answer to my problem.

i dont see your call to set the screen to fullscreen ?
http://download.oracle.com/javase/tutorial/extra/fullscreen/exclusivemode.html

I have decided to use the cardLayout and changing my code around a little bit.