Change title bar and window icon

Question

I want to change the title bar icon of the Java window, as shown below:

I’m going the method initComponents() and leaving as it is in the code below, but the line setIconImage(iconeTitulo); is left as a mistake.

public FrmConfiguracoes() {
        initComponents();

    URL caminhoImagem = this.getClass().getClassLoader().getResource("smile.png");
    Image    iconeTitulo = Toolkit.getDefaultToolkit().getImage(caminhoImagem);
    setIconImage(iconeTitulo);

    }

It does not recognize the command and does not change the icon. What can I do? And how to change the logo that is in the minimized icon?

Answer 1

When retrieving the image URL, remove the call getClassLoader() as follows:

public FrmConfiguracoes() {

    initComponents();

    URL caminhoImagem = this.getClass().getResource("smile.png");
    Image    iconeTitulo = Toolkit.getDefaultToolkit().getImage(caminhoImagem);
    setIconImage(iconeTitulo);
}

Keep in mind that it will still only work if the class and image are in the same project directory(package).

---

Another way is to call using the class ImageIO:

public FrmConfiguracoes() {

    initComponents();

    try {

        Image iconeTitulo = ImageIO.read(getClass().getResource("smile.png"));

    } catch(IOException ex) {
      System.out.println("Erro ao importar icone: " ex.getMessage());
    }         
    setIconImage(iconeTitulo);
}

Both forms already change the window icon and also the icon that is displayed in the windows taskbar, displaying the image you pointed out in your project, see an example in the image below: