拍摄，像这样，在组件（这里是JLabel而不是JPanel）设置了preferredSize，然后将其放置在使用适当布局的另一个JPanel中，这里是GridBagLayout，默认设置会将组件居中，并使用GridBagLayout添加使用面板将JPanel转换为CardLayout
：：
import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.Border;public class MultiSizedPanels { private static void createAndShowUI() { final CardLayout cardLayout = new CardLayout(); final JPanel cardHolder = new JPanel(cardLayout); JLabel[] labels = { new JLabel("Small Label", SwingConstants.CENTER), new JLabel("Medium Label", SwingConstants.CENTER), new JLabel("Large Label", SwingConstants.CENTER)}; for (int i = 0; i < labels.length; i++) { int padding = 50; Dimension size = labels[i].getPreferredSize(); size = new Dimension(size.width + 2 * (i + 1) * padding, size.height + 2 * (i + 1) * padding); labels[i].setPreferredSize(size); Border lineBorder = BorderFactory.createLineBorder(Color.blue); labels[i].setBorder(lineBorder); JPanel containerPanel = new JPanel(new GridBagLayout()); containerPanel.add(labels[i]); cardHolder.add(containerPanel, String.valueOf(i)); } JButton nextButton = new JButton("Next"); nextButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { cardLayout.next(cardHolder); } }); JPanel btnHolder = new JPanel(); btnHolder.add(nextButton); Jframe frame = new Jframe("MultiSizedPanels"); frame.getContentPane().add(cardHolder, BorderLayout.CENTER); frame.getContentPane().add(btnHolder, BorderLayout.SOUTH); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { createAndShowUI(); } }); }}
