import javax.swing.*;import java.awt.*;import java.awt.event.ActionListener;public class CardLayoutTest {    Frame f = new Frame("cardlayout test");    Panel p1 = new Panel();    String[] names = {
   "上一张","下一张","第一张","最后一张","第三张"};    public void init(){        final var c =  new CardLayout();        p1.setLayout(c);        for(var i = 0; i < names.length; i++){            p1.add(names[i], new JButton(names[i]));        }        var p  = new Panel();        ActionListener listener = e -> {            switch (e.getActionCommand()){                case "上一张":                    System.out.println("previous");                    c.previous(p1);                    break;                case "下一张":                    c.next(p1);                    System.out.println("next");                    break;                case "第一张":                    c.first(p1);                    System.out.println("first");                    break;                case "最后一张":                    c.last(p1);                    System.out.println("last");                    break;                case "第三张":                    c.show(p1, "第三张");                    System.out.println("third");                    break;            }        };        var previous = new JButton("上一张");        previous.addActionListener(listener);        var next = new JButton("下一张");        next.addActionListener(listener);        var first = new JButton("第一张");        first.addActionListener(listener);        var last = new JButton("最后一张");        last.addActionListener(listener);        var third = new JButton("第三张");        third.addActionListener(listener);        p.add(previous);        p.add(next);        p.add(first);        p.add(last);        p.add(third);        f.add(p1);        f.add(p, BorderLayout.NORTH);        f.setLocation(100,100);        f.setBounds(100,100,300,500);        f.pack();        f.setVisible(true);    }    public static void main(String[] args) {        new CardLayoutTest().init();    }}

output: