How to change java icon in a JFrame

问题

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);

}

回答1:

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.

回答2:

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.

回答3:

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");
}

回答4:

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

回答5:

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()
{

来源：https://stackoverflow.com/questions/17815033/how-to-change-java-icon-in-a-jframe

标签

java

swing

icons

jframe

imageicon