問題:
設定背景影像時,我的 JComponent 不可見。我該如何解決這個問題?
代碼:
請參閱問題描述中提供的代碼。
答案:
要為JPanel 新增背景影像,您可以使用以下指令步驟:
使用自訂Panel:
class CustomPanel extends JPanel { private BufferedImage image; public CustomPanel(BufferedImage image) { this.image = image; } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(image, 0, 0, this); } }
BufferedImage myPicture = ImageIO.read(new File("c:\bgd.png"));
CustomPanel picPanel = new CustomPanel(myPicture); window.add(picPanel, c);
使用JLabel:
JLabel picLabel = new JLabel(new ImageIcon(myPicture)); mainp.add(picLabel, c);
其他注意事項:
使用自訂JPanel 的範例:
import java.awt.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.*; public class BackgroundImageExample { public static void main(String[] args) { try { // Create the main window JFrame window = new JFrame("Window with Background Image"); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setSize(300, 250); window.setResizable(false); // Create the background image and CustomPanel BufferedImage image = ImageIO.read(new File("path/to/background.png")); CustomPanel picPanel = new CustomPanel(image); picPanel.setOpaque(true); // Add the CustomPanel to the main window window.add(picPanel); // Show the window window.setVisible(true); } catch (IOException e) { e.printStackTrace(); } } }
範例使用JLabel:
import java.awt.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.*; public class BackgroundImageExample { public static void main(String[] args) { try { // Create the main window JFrame window = new JFrame("Window with Background Image"); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setSize(300, 250); window.setResizable(false); // Create the background image and JLabel BufferedImage image = ImageIO.read(new File("path/to/background.png")); JLabel picLabel = new JLabel(new ImageIcon(image)); picLabel.setOpaque(true); // Add the JLabel to the main window window.add(picLabel); // Show the window window.setVisible(true); } catch (IOException e) { e.printStackTrace(); } } }範例使用JLabel>
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