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How do I change image icon of a JFrame?

I looked at other answers and tried:
ImageIcon img = new ImageIcon(url);
setIconImage(img.getImage());
and:
URL imgURL = getClass().getClassLoader().getResource(url);
if (imgURL != null) {
System.out.println("Found icon image: "+imgURL);
Image image=Toolkit.getDefaultToolkit().getImage(imgURL);
setIconImage(image);
} else {
System.err.println("Could not find icon image");
}
Within the JFrame class and I put the image file in the resource folder, and also the same folder as my .java files and the root folder of my project and even included the "/" symbol at the beginning of the URL string but nothing is working. I was wondering if anyone tried it lately and got it working?

I don't know what's inside your url string but there is another way to set the icon to a JFrame:
frame.setIconImage((Image)ImageIO.read(getClass().getResourceAsStream("/imagename.png")));
The / symbol means that your path is relative to your project root.
EDIT:
JFrame.setIconImage(Image image) doesn't work on macOS.
Instead you can use Application.getApplication().setDockIconImage(Image image) of the com.apple.eawt.Application package to get it work. (as mentioned by #Valencia Starr)

I got it to work.
So apparently Macs come installed with a library and I also had to make sure I had Java 1.8 in my build path.
I imported the com.apple.eawt.Application package and used Application.getApplication().setDockIconImage(image) which works on macOS and not on Windows.

Insert icon into Java Swing JFrame

I checked many previous questions here on stackoverflow but none has been a solution to the problem I have.
I must "simply" insert an icon in my JFrame, I tried to do it this way (from another stackoverflow question):
// ico file is in the same folder
ImageIcon frameIcon = new ImageIcon("/iconqm16.ico");
jFrame1.setIconImage(frameIcon.getImage());
but this didn't work. After this I tried the following:
URL iconURL = getClass().getResource("/iconqm(20x20).png");
ImageIcon icon = new ImageIcon(iconURL);
jFrame1.setIconImage(icon.getImage());
This time I used .png because I read that .ico is Windows specific. And I used class resource because it can be packed in the jar.
But my icon doesn't appear yet. Someone can find any error in these snippets? Maybe it is a problem of image dimensions? I tried 16x16, 20x20, 32x32 but none worked.
EDIT
I found out the problem. Tried this code below and my program can't find the file even if the path is correct. I checked it well before editing my question, can you help me understand why can't find the image file?
URL url = getClass().getResource("C:/Users/Sergio/Documents/NetBeansProjects/Queue Manager v1.0/icon/icon16px.png");
if (url == null) {
System.out.println("Could not find image!");
} else {
jFrame1.setIconImage(new ImageIcon(url).getImage());
}
}
EDIT
This finally worked, but honestly I don't get the reason why getClass().getResource(pathToFile) did not work. Used this solution:
try {
// Set Frame's Icon
BufferedImage img = ImageIO.read(new File("C:\\Users\\Sergio\\Documents\\NetBeansProjects\\Queue Manager v1.0\\icon\\icon16px.png"));
this.setIconImage(img);
} catch (IOException ex) {
Logger.getLogger(QueueManagerForm.class.getName()).log(Level.SEVERE, null, ex);
}
Thanks for the help!

How to change java icon in a JFrame

Ok so I've been researching this one quiet a bit. I am fairly new to java but thought that this one would be easy. Ive tried just about every way that has been answered on this site and still no luck, and usually when I look here I am able to find a answer that fits what I am looking for. Does anyone know how to change the Java icon in the top corner of the JFrame. I'm pretty positive that its not my file path either because all my images are in the same folder and they all work, this is the only one that I can't seem to get to work.
This is the first part my code for the main menu of my program, everything works except when i try to add the icon image. The code I've entered below does not have anything in it for the JFrame IconImage, I removed it since it didn't work. So if there is someone who knows how to get it working with this code that would be highly appreciated, thank you very much in advanced!
public class MainFrame
{
private MyPanel main;
private MyPanel2 create;
private MyPanel3 update;
private MyPanel4 find;
JFrame frame = new JFrame("Main Menu:");
public void displayGUI()
{
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
contentPane.setLayout(new CardLayout());
main = new MyPanel(contentPane, this);
create = new MyPanel2(contentPane);
update = new MyPanel3(contentPane);
find = new MyPanel4(contentPane);
contentPane.add(main, "Main Menu");
contentPane.add(create, "Create Part");
contentPane.add(update, "Update Part");
contentPane.add(find, "Find Part");
frame.setLocation(200, 200);
frame.setSize(700, 580);
frame.setContentPane(contentPane);
frame.setVisible(true);
}

I have an answer for you. First, make sure that the images are in a folder, not a package. Next, insert this line of code:
Image image = Toolkit.getDefaultToolkit().getImage(getClass().getResource("path/to/image.png"));
ImageIcon icon = new ImageIcon( );
setIconImage(icon.getImage());
This code gets the image from the class path, and returns it as a image icon, and then it sets it. This should add the image icon to the application. If it doesn't, then tell me.
EDIT: After you told me that that didn't work then I decided to take a second crack at it...
First, put your images into a completely separate folder. I usually call this /res. Next, put your image in there. Now, for loading I took a completely different route. I decided to use ImageIO instead of default loading. To load the image, you use this code:
try {
frame.setIconImage(ImageIO.read(new File("res/icon.png")));
}
catch (IOException exc) {
exc.printStackTrace();
}
ImageIO works a lot better for loading images. If this still doesn't work then please tell me.
If you want to export this as a JAR then put a folder the same name as you used in the program in the same directory as the JAR.

For example in a NetBeans project, create a resources folder in the src folder.
Put your images (jpg, ...) in there.
Whether you use ImageIO or Toolkit (including getResource),
you must include a leading / in your path to the image file:
Image image = Toolkit.getDefaultToolkit().getImage(getClass().getResource("/resources/agfa_icon.jpg"));
setIconImage(image);
If this code is inside your JFrame class, the image is added to the frame as an icon in your title bar.

This works pretty fine for me.
Just add this after you've created your JFrame.
try {
Image image = new ImageIcon("/icons/image.jpg").getImage();
frame.setIconImage(image);
}catch(Exception e){
System.out.println("Application icon not found");
}

Paste your image icon (fav.png) in the same package first,
Write following code in constructor of JFrame:
setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource("fav.png")));
Note:- fav.png is the name of icon

this.setIconImage(new ImageIcon(getClass().getResource("/iconsfolder/iconsname.jpg")).getImage());
// sets the Global icon for the system
try this code put after this code:
public void displayGUI()
{

Adding images in java [duplicate]

I have 6 JButtons on my GUI all have images on it,
when I compile and run the code, all images on JButtons show up perfectly
but in runnable JAR file, images on JButtons are not showing up.. how do I fix this problem?
I used this method in my code to show icons on JButtons
ImageIcon SettingsIc = new ImageIcon("bin/images/settings.png");
jb1 = new JButton(SettingsIc);
jb1.setFocusPainted( false );
//jb1.setBorderPainted(false);
jb1.setContentAreaFilled(false);
This is how my GUI looks when I compile my code in Eclipse
This is how my GUI looks after executing Runnable JAR file

This (as pointed out by a number of people)
ImageIcon SettingsIc = new ImageIcon("bin/images/settings.png");
Suggests that you are trying to load the images from the bin/images off the file systems. This is a relative path from the execution point of your application.
ImageIcon won't complain if the file does not exist.
If possible, you are better off embedding the resources within your Jar file (it will make it easier to deploy) and use something like getClass().getResource("/bin/images/settings.png") to load the images.
If possible, you should try using ImageIO.read(URL) to load your images, it will throw an exception if the resource pointed to by the File/URL does not exist (or is invalid).

Just keep the jar and images in the same folder and
keep
ImageIcon icon = new ImageIcon("image.jpg");
in the code

Unable to get image icon in runnable jar

I wrote a method in order to get icon for my swing:
public Icon getIcon(String iconName) {
Icon icon = null;
if(iconName.equals("NEXT")){
icon = new ImageIcon( getClass().getResource("resources/img/next.png" ) );
}
return icon;
}
but
icon = new ImageIcon( getClass().getResource("resources/img/next.png" ) );
goes in null pointer
I created a source folder "resources" and a folder "img" inside it with "next.png" icon
Where's the problem?
Thanks

For this to work, the resources folder should be in the same folder as the folder corresponding to the package of this.getClass(). To start from the root of the classpath, use getClass().getResource("/resources/img/next.png"). (with a leading /)

so, I found the right method:
public static ImageIcon getImageIcon(String iconName) {
ImageIcon imageIcon = null;
if(iconName.equals("DOWNLOAD")){
imageIcon = new ImageIcon(ImagesLocation.class.getResource("/img/download.png"));
}
return imageIcon;
}
with a "resources" source folder at the same level of the project and with an img folder inside (package styled)
ImagesLocation is a generic class containing this method

For those in need of help that have come across this page in Google - I wrote an answer in another StackOverflow question giving the best way to handle images in JAVA apps so that you can easily access the images for all image method types in Java:
This IS the best way to handle all images and icons in a JAR App.
Once you've zipped up all of your images and icons into its own JAR file - Configure your build path by adding the images JAR file into your libraries tab so that its now included in your classpath.
Then simply use the following 3x lines of code at the start of your constuctor to access any image you need for anything including a SystemTray image which doesn't accept the simple ImageIcon's as its main icon (weird I know). The 3x lines are:
URL iconUrl = this.getClass().getResource("/image-iconb.png");
Toolkit tk = this.getToolkit();
someimgicon = tk.getImage(iconUrl);
(someimgicon is just a constructor declared Image variable)
Now you can set a window icon as simply as:
setIconImage(someimgicon);
and at the same time use the same variable when setting the System TrayIcon by declaring:
trayIcon = new TrayIcon(someimgicon, "SystemTray Demo", popupMenu);
The above allows you to declare Images or ImageIcons easily and centrally without running the risk of not keeping image resources in the right place. It keeps it nice and tidy, with the JAR containing all your images automatically compiled at run time and distribution of your program.
As a bonus, once the JAR is registered in your classpath - you can keep adding any other images into the same JAR at any time without any fuss too - Everything just works and the added images are instantly available to your app.
Much better in my view.