CardLayeroutTest.java

package java_GUI;

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class CardLayeroutTest {
	public static void main(String[] args) {
		JFrame f = new JFrame("CardLayerout");
		JPanel comboBoxPane = new JPanel();
		String buttonPanel = "按钮面板";
		String inputPanel = "输入框面板";
		String comboBoxItems[] = { buttonPanel, inputPanel };
		JComboBox<String> cb = new JComboBox<>(comboBoxItems);
		comboBoxPane.add(cb);

		// 两个Panel充当卡片
		JPanel card1 = new JPanel();
		card1.add(new JButton("按钮 1"));
		card1.add(new JButton("按钮 2"));
		card1.add(new JButton("按钮 3"));

		JPanel card2 = new JPanel();
		card2.add(new JTextField("输入框", 20));

		JPanel cards; // a panel that uses CardLayout
		cards = new JPanel(new CardLayout());
		cards.add(card1, buttonPanel);
		cards.add(card2, inputPanel);

		f.add(comboBoxPane, BorderLayout.NORTH);
		f.add(cards, BorderLayout.CENTER);

		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(250, 150);
		f.setLocationRelativeTo(null);
		f.setVisible(true);

		cb.addItemListener(new ItemListener() {
			@Override
			public void itemStateChanged(ItemEvent evt) {
				CardLayout cl = (CardLayout) (cards.getLayout());
				cl.show(cards, (String) evt.getItem());
			}
		});
	}
}