How can I set a photo to fill the entire window in Java?

To fill the entire Java window with a photo, you can use the javax.swing.ImageIcon class and javax.swing.JLabel class. Here is an example code:

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class PhotoFrame extends JFrame {
    public PhotoFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("照片窗体");
        
        // 创建一个面板
        JPanel panel = new JPanel();
        
        // 创建一个标签
        JLabel label = new JLabel();
        
        // 加载照片并设置到标签
        ImageIcon imageIcon = new ImageIcon("path_to_your_photo.jpg");
        label.setIcon(imageIcon);
        
        // 设置标签的大小
        label.setSize(imageIcon.getIconWidth(), imageIcon.getIconHeight());
        
        // 将标签添加到面板
        panel.add(label);
        
        // 将面板添加到窗体
        getContentPane().add(panel);
        
        // 调整窗体大小以适应照片
        pack();
        
        // 设置窗体为全屏
        setExtendedState(JFrame.MAXIMIZED_BOTH);
        
        // 显示窗体
        setVisible(true);
    }

    public static void main(String[] args) {
        new PhotoFrame();
    }
}

In the example code above, we created a subclass of the JFrame class called PhotoFrame. In the constructor, we created a panel and a label, loaded a photo into the label, and added the label to the panel. Next, we added the panel to the window, resized the window to fit the photo, set it to full screen, and displayed the window. Please replace path_to_your_photo.jpg with your own photo path.