Java在窗口中設置背景圖片

import java.awt.Container;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * 設置背景圖片類

 */
public class BackgroundImage {
    
    public BackgroundImage(JFrame frame,Container container,String ImageName) {
        // 限定加載圖片路徑，相對路徑
        ImageIcon icon= new ImageIcon("res/" + ImageName);            
        final JLabel labelBackground = new JLabel();
        ImageIcon im = icon;
        labelBackground.setIcon(im);
        // 設置label的大小
        labelBackground.setBounds(0,0,im.getIconWidth(),im.getIconHeight());        
        // 將背景圖片標簽放入面板的最底層
        frame.getLayeredPane().add(labelBackground,new Integer(Integer.MIN_VALUE));
        // 將容器轉換為面板設置為透明
        JPanel panel = (JPanel)container;
        panel.setOpaque(false);
        
    }
    

}