Is it possible to change the application icon using JavaFX, or does it have to be done using Swing?
17 Answers
Assuming your stage is "stage" and the file is on the filesystem:
stage.getIcons().add(new Image("file:icon.png"));
As per the comment below, if it's wrapped in a containing jar you'll need to use the following approach instead:
stage.getIcons().add(new Image(<yourclassname>.class.getResourceAsStream("icon.png")));
Full program for starters :) This program sets icon for StackOverflowIcon.
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class StackoverflowIcon extends Application {
@Override
public void start(Stage stage) {
StackPane root = new StackPane();
// set icon
stage.getIcons().add(new Image("/path/to/stackoverflow.jpg"));
stage.setTitle("Wow!! Stackoverflow Icon");
stage.setScene(new Scene(root, 300, 250));
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Output Screnshot

Updated for JavaFX 8
No need to change the code. It still works fine. Tested and verified in Java 1.8(1.8.0_45). Path can be set to local or remote both are supported.
stage.getIcons().add(new Image("/path/to/javaicon.png"));
OR
stage.getIcons().add(new Image("https://example.com/javaicon.png"));

Hope it helps. Thanks!!
If you have have a images folder and the icon is saved in that use this
stage.getIcons().add(new Image(<yourclassname>.class.getResourceAsStream("/images/comparison.png")));
and if you are directly using it from your package which is not a good practice use this
stage.getIcons().add(new Image(<yourclassname>.class.getResourceAsStream("comparison.png")));
and if you have a folder structure and you have your icon inside that use
stage.getIcons().add(new Image(<yourclassname>.class.getResourceAsStream("../images/comparison.png")));
What do you think about creating new package i.e image.icons in your src directory and moving there you .png images? Than you just need to write:
Image image = new Image("/image/icons/nameOfImage.png");
primaryStage.getIcons().add(image);
This solution works for me perfectly, but still I'm not sure if it's correct (beginner here).
If you run the jar file, the code specified by Michael Berry will change the icon in the title bar and in the taskbar. Shortcut icon cannot be changed.
If you run a native program compiled with com.zenjava, You must add a link to the program icon:
<plugin>
<groupId>com.zenjava</groupId>
<artifactId>javafx-maven-plugin</artifactId>
<version>8.8.3</version>
<configuration>
...
<bundleArguments>
<icon>${project.basedir}/src/main/resources/images/filename.ico</icon>
</bundleArguments>
</configuration>
</plugin>
This will add an icon to the shortcut and taskbar.
Toggle icons in runtime:
In addition to the responses here, I found that once you have assigned an Icon to your application by the first time you cannot toggle it by just adding a new icon to your stage (this would be helpful if you need to toggle the icon of your app from on/off enabled/disabled).
To set a new icon during run time use the getIcons().remove(0) before trying to add a new icon, where 0 is the index of the icon you want to override like is shown here:
//Setting icon by first time (You can do this on your start method).
stage.getIcons().add(new Image(getClass().getResourceAsStream("enabled.png")));
//Overriding app icon with a new status (This can be in another method)
stage.getIcons().remove(0);
stage.getIcons().add(new Image(getClass().getResourceAsStream("disabled.png")));
To access the stage from other methods or classes you can create a new static field for stage in you main class so can access it from out of the start() method by encapsulating in on a static method that you can access from anywhere in your app.
public class MainApp extends Application {
private static Stage stage;
public static Stage getStage() { return stage; }
@Override public void start(Stage primaryStage) {
stage = primaryStage
stage.getIcons().add(new Image(getClass().getResourceAsStream("enabled.png")));
}
}
public class AnotherClass {
public void setStageTitle(String newTitle) {
MainApp.getStage().setTitle(newTitle);
MainApp.getStage().getIcons().remove(0);
MainApp.getStage().getIcons().add(new Image(getClass().getResourceAsStream("disabled.png")));
}
}
Another easy way to insert your own icon on the title bar in JavaFX is to add the image to your primary stage using the following method:
Image ico = new Image("resources/images/iconLogo.png");
stage.getIcons().add(ico);
Make sure your import javafx.scene.image.Image (if using an ide like netbeans this should be automatically done for you).