如何在Java中将图像分配给JLabel？

Question

I want to assign an png image to JLabel .

I tried this code but no image appears [update]:

class firstPokemonChoose extends JFrame{
    private static final int WIDTH = 800; //ukuran panjang window
    private static final int HEIGHT = 800; //ukuran lebar window
    JLabel intro, tryImage;

    public firstPokemonChoose(){
        setTitle("Choose Your Pokemon"); //set judul window
        setSize(WIDTH, HEIGHT); //set ukuran

        intro = new JLabel("Please choose your first Pokemon", SwingConstants.LEFT);

        java.net.URL url = getClass().getResource("torchic.png");
        ImageIcon img = new ImageIcon(url);
        tryImage.setIcon(img);

        Container pane = getContentPane();
        pane.setLayout(new GridLayout(3, 3));
        pane.add(intro);
        pane.add(tryImage);

        setVisible(true); //set windows visible
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        validate();

    }
}

Answer 1

You have to supply to the JLabel an Icon implementation (ie ImageIcon). You can do it trough the setIcon method, as in your question, or through the JLabel constructor: Try this

tryImage.setIcon(new ImageIcon(path));

Answer 2

I recommend to put your images in your project because in this way, your image will be portable with the project and no path should be modify in the code.

If the image is in your project classpath, try this:

java.net.URL url = getClass().getResource("/Resources/torchic.png");
ImageIcon image = new ImageIcon(url);
tryImage .setIcon(image);

If not, you have to define the absolute path of the image as below:

tryImage.setIcon(new ImageIcon("path\\torchic.png"));

Update:

You have 2 errors in your code:

The first that you should give the complete path of the image "/Resources/torchic.png" and not only torchic.png

The second is you are trying to set a icon to the not initialize tryImage JLabel

Edit your code as below:

 class firstPokemonChoose extends JFrame{ private static final int WIDTH = 800; //ukuran panjang window private static final int HEIGHT = 800; //ukuran lebar window JLabel intro, tryImage; public firstPokemonChoose(){ setTitle("Choose Your Pokemon"); //set judul window setSize(WIDTH, HEIGHT); //set ukuran intro = new JLabel("Please choose your first Pokemon", SwingConstants.LEFT); tryImage = new JLabel(); // initialize the tryImage label java.net.URL url = getClass().getResource("/Resources/torchic.png"); ImageIcon img = new ImageIcon(url); tryImage.setIcon(img); Container pane = getContentPane(); pane.setLayout(new GridLayout(3, 3)); pane.add(intro); pane.add(tryImage); setVisible(true); //set windows visible setDefaultCloseOperation(EXIT_ON_CLOSE); validate(); } public static void main(String [] args){ firstPokemonChoose firstPokemonChooseInstance = new firstPokemonChoose(); } }