Question

我想将png图像分配给JLabel。

我尝试了这段代码，但没有出现图片[更新]：

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

您必须向JLabel提供Icon实现（即ImageIcon）。您可以通过setIcon方法（如您的问题）或通过JLabel构造函数执行此操作：尝试此操作

tryImage.setIcon(new ImageIcon(path));

Answer 2

我建议您将图像放入项目中，因为这样，您的图像将随项目一起移植，并且代码中不应修改任何路径。

如果图像位于项目类路径中，请尝试以下操作：

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

如果没有，您必须定义图像的绝对路径，如下所示：

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

更新：

您的代码中有2个错误：

首先应该提供图片的完整路径"/Resources/torchic.png"，而不仅仅是torchic.png

第二个是你试图将图标设置为不初始化的tryImage JLabel

编辑您的代码，如下所示：

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();
    }
}

如何在Java中将图像分配给JLabel？

2 个答案:

更新：