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Program icon not showing up after Clean and Build (Netbeans)

I'm new at Java and also swing. I just created a small app using JFrame and added some buttons and textFields, also I have a method which set the icon that I want for the taskbar and the one in the left corner.
When I run the program in Netbeans everything seems correctly, but when I build the project the icon it's not showing up. I tried a lot of things but none of them worked for me.
here's the method that I use for the program:
private void setIcon() {
ImageIcon imageIcon = new ImageIcon("src/main/java/icons/steam.png");
this.setIconImage(imageIcon.getImage());
}
And I call the method from the constructor.
Thank you.
EDIT 1:
Implementing what Andrew said, now I have this:
BufferedImage img = null;
try {
URL url = getClass().getResource("src/main/java/icons/steam.png");
img = ImageIO.read(url);
} catch (IOException e) {
}
this.setIconImage(img);
And that's on the constructor. But when I run it I get:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: input == null!
at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1400)
I tried different paths but I can't get it. And yes, I'm sure that "steam.png" is there.

I been looking for a solution to this and I finally get it (thanks to Andrew trough the comments)
First I edited my code as you can see in EDIT 1
After that, I got an IllegalArgumentException and the problem was that I didn't have a "resources" folder under /src
So I created my resources folder under src/main/resources and put my image inside
Then I got it using
URL url = getClass().getResource("/icons/steam.png");
img = ImageIO.read(url);
And that was the fix for my problem, now when I run the program images are now loaded.
Thank you so much!

Randomize between two pictures

I’m building a program and I’m stuck at picking a random image that already is defined in the program.
Here’s the code:
Image Opic = new Image(getClass().getResourceAsStream("Resource/O1.png"));
Image Xpic = new Image(getClass().getResourceAsStream("Resource/X1.png"));
Image PlayerPic = new Random[Opic,Xpic];
Image AiPic = new Random[Opic,Xpic];

Image Opic = new Image(getClass().getResourceAsStream("Resource/O1.png"));
Image Xpic = new Image(getClass().getResourceAsStream("Resource/X1.png"));
Image PlayerPic = Math.random() > 0.5 ? Opic : Xpic;
Not sure what language you are actually coding in, since it does not look like javascript (well not Java either) to me. But this is just a demonstration in Java on how this problem can be approach. You can almost for sure be able to find similar method in any language.

Custom ToolBar with Java Swing for Desktop

I have created a GUI with Java Swing and wanting to create a custom toolbar according to my modules. Below are the images am wanting to use:
These images are placed in the same level as the src folder within my application. I am aware that I can perhaps create a jar with these images so that I can easily access them from within my application but do not know how. I have spent hours trying to make this work.
Below is my GUI that I have created ad wanting to beautify with these images for the toolbar else create an array of labels that will act as a navigation but either approach I couldn't get it to work.
The code below was my last attempt on this:
JToolBar toolbar1 = new JToolBar();
ImageIcon client = new ImageIcon("clients.png");
ImageIcon timesheet = new ImageIcon("timesheets.png");
JButton clientTB = new JButton(client);
JButton timesheetTB = new JButton(timesheet);
toolbar1.add(clientTB );
toolbar1.add(timesheetTB);
add(toolbar1, BorderLayout.NORTH);
I even moved these images and placed them within the class that's calling them.
What could I be doing wrong, please help?

You have a look at the JavaDocs for ImageIcon(String), the String value is "a String specifying a filename or path"
This is a problem, because your images aren't actually files, any more, they have been embedded within your application (typically within the resulting jar file) and no longer be treated like "normal files".
Instead, you need to use Class#getResource which searches the application's classpath for the named resource, something like...
// This assumes that the images are in the default package
// (or the root of the src directory)
ImageIcon client = new ImageIcon(getClass().getResource("/clients.png"));
Now, I have a personal dislike for ImageIcon, because it won't tell you when the image is loaded for some reason, like it can't be found or it's the wrong format.
Instead, I'd use ImageIO to read the image
ImageIcon client = new ImageIcon(ImageIO.read(getClass().getResource("/clients.png")));
which will do two things, first, it will throw a IOException if the image can't be loaded for some reason and two, it won't return until the image is fully loaded, which is helpful.
See Reading/Loading an Image for more details

Why is the application not showing upon adding icon to JMenuItem?

I've been running into a problem lately where I try to se a JMenuItems icon which when I define and point to the icon the application it self don't start/show.
I started looking for errors, but there where none; started looking for write occurencies, which typically pretty much does appear when I add the icon and after that as pointed above the application doesn't start/show.
When the icon is set but commented:
Code
mntmMaximize = new JMenuItem();
mntmMaximize.setText("Maximize Window");
mntmMaximize.setActionCommand("maximize");
mntmMaximize.addActionListener(this);
mntmMaximize.setMnemonic(KeyEvent.VK_PLUS);
mntmMaximize.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_PLUS, ActionEvent.CTRL_MASK));
// mntmMaximize.setIcon(new ImageIcon(Vision.class.getResource("xray/fullscreen16x.png")));
mnWindow.add(mntmMaximize);<br>
Picture:
Screen Shot Of Visible Application
After the icon is set and trying to execute application:
Code:
mntmMaximize = new JMenuItem();
mntmMaximize.setText("Maximize Window");
mntmMaximize.setActionCommand("maximize");
mntmMaximize.addActionListener(this);
mntmMaximize.setMnemonic(KeyEvent.VK_PLUS);
mntmMaximize.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_PLUS, ActionEvent.CTRL_MASK));
mntmMaximize.setIcon(new ImageIcon(Vision.class.getResource("xray/fullscreen16x.png")));
mnWindow.add(mntmMaximize);<br>
Picture:
The window not created and application terminated
Note that when the window is not created in this picture the application is therefor terminated.
Please try to answer nice, and if you need the whole source file it is possible.
Edit:
Also if needed i can make a video where i show when i start the application when the icon is set but not commented.

getResource uses the relative path with respect to the package (folder), like in
Vision.class.getResource("fullscreen16x.png")
or absolute like in:
Vision.class.getResource("/xray/fullscreen16x.png")

Jdialog box Title bar icon change

I need to change the Jdialog box title bar icon. By default it uses a java coffee image.
I have searched in internet and used many codes
1. Image im = Toolkit.getDefaultToolkit().getImage("/org/qmon/generate/Images/JDialog -2.ico");
dialog.setIconImage(im);
2. Toolkit kit = Toolkit.getDefaultToolkit ();
Image img = kit.getImage ("/org/qmon/generate/Images/Create File Tag-16x16.png");
dialog.setIconImage(img);
nothing works properly.. Kindly help me.. Thanks in Advance

Firtsly, ico is not a support image format for Java.
The likely reason you're having issues with the second approach is that getImage is expecting a file reference and the image you seem to referencing looks like it's embedded (stored within your application)
Try using something more like...
Image img = kit.getImage (getClass().getResource("/org/qmon/generate/Images/Create File Tag-16x16.png"));
Instead.
Personally, I prefer ImageIO.read as it throws a IOException when something goes wrong...
Image img = ImageIO.read(getClass().getResource("/org/qmon/generate/Images/Create File Tag-16x16.png"));
But that's me...
You should also consider taking a look at Convert List<BufferedImage> to Image which demonstrates the use of ico file (from a 3rd party API) and setIconImages method

Image image = ImageIO.read(new URL(
"http://www.gravatar.com/avatar/f1d58f7932b6ae8027c4e1d84f440ffe?s=128&d=identicon&r=PG"));
dialog.setIconImage( image );
dialog.setVisible(true);

I am using this in my application and working fine
java.net.URL url = ClassLoader.getSystemResource("res/java.png");
ImageIcon icon = new ImageIcon(url);
JOptionPane.showMessageDialog(null, jep, "UroSync",JOptionPane.INFORMATION_MESSAGE, icon);

To improve what MadProgrammer has said, I met the problem and I solved it instantiating a JDialog but using the static class Toolkit method getDefaultToolkit().getImage(Image img).
JDialog dialog = new JDialog();
dialog.setIconImage(Toolkit.getDefaultToolkit().getImage(MyMainClass.class.getResource("/myIcon.png")));
To do that you need to add before the image into the build path of the Project.