Java 内部类与局部变量问题

为项目编写程序。我需要使用ListSelectionListener从JList中获取当前选择，以确定另一个面板使用的CardLayout的当前卡。如果不是直接使用CardLayout类的show方法在侦听器中更改当前卡，我希望至少能够让侦听器创建一个带有选择名称的字符串。最简单的方法是什么，最终会导致当前卡被更换？非常感谢您的帮助

资料来源：

import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;

public class ClientApp extends JFrame
{
    public static void main(String[] args)
    {
        new ClientApp();
    }


    public ClientApp()
    {
        this.setSize(750,380);
        this.setTitle("Honeydukes Muggle Ordering System");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel infoPanel = new JPanel(new CardLayout());
        JPanel invntryPanel = new JPanel();


        //Creating the array for the invntryPanel Jlist

        String[] candy = {"Acid Pops", "Bat's Blood Soup",
                          "Bertie Bott's Every Flavour Beans",
                          "Blood-flavoured Lollipops",
                          "Cauldron Cakes", "Charm Choc",
                          "Chocoballs", "Chocolate Cauldrons",
                          "Chocolate Frogs", "Chocolate Skeletons",
                          "Chocolate Wands", "Choco-Loco", "Cockroach Clusters",
                          "Nougat", "Crystallised Pineapple",
                          "Drooble's Best Blowing Gum", "Exploding Bonbons",
                          "Toffees", "Fizzing Whizzbees",
                          "Fudge Flies", "Ice Mice",
                          "Jelly Slugs", "Liquourice Wands",
                          "Pepper Imps", "Peppermint Toads",
                          "Pink Coconut Ice", "Pixie Puffs",
                          "Pumpkin Fizz", "Salt Water Taffy",
                          "Shock-o-Choc", "Skeletal Sweets",
                          "Splindle's Lick'O'Rish Spiders",
                          "Sugar Quills", "Sugared Butterfly Wings",
                          "Toothflossing Stringmints", "Tooth-Splintering Strongmints",
                          "Treacle Fudge", "Chocolates", "Wizochoc"};
        JList candyList = new JList(candy);
        candyList.setVisibleRowCount(18);
        candyList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        ListSelectionListener sl = new ListSelectionListener() {
           public void valueChanged(ListSelectionEvent e) {
            if (e.getValueIsAdjusting() == false) {
                CardLayout.show(infoPanel, (String)candyList.getSelectedValue());
            }
           }
        };

        candyList.addListSelectionListener(sl);

        //Creating a scrollpane for the JList
        JScrollPane scroll = new JScrollPane(candyList, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                                             JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        invntryPanel.add(scroll);


        //Creating the cards
        JPanel startCard = new JPanel(new BorderLayout());
        JPanel acidPopsCard = new JPanel();
        JPanel batsBloodSoupCard = new JPanel();
        JPanel bertieBottsCard = new JPanel();
        JPanel bloodPopsCard = new JPanel();
        JPanel cauldronCakesCard = new JPanel();
        JPanel charmChocCard = new JPanel();
        JPanel chocoballsCard = new JPanel();
        JPanel chocCauldronsCard = new JPanel();
        JPanel chocFrogsCard = new JPanel();
        JPanel chocSkeleCard = new JPanel();
        JPanel chocWands = new JPanel();
        JPanel chocolocoCard = new JPanel();
        JPanel roachClustersCard = new JPanel();
        JPanel nougatCard = new JPanel();
        JPanel crystalPineappleCard = new JPanel();
        JPanel droobleGumCard = new JPanel();
        JPanel explodeBonbonsCard = new JPanel();
        JPanel toffeesCard = new JPanel();
        JPanel fizzWhizCard = new JPanel();
        JPanel fudgeFliesCard = new JPanel();
        JPanel iceMiceCard = new JPanel();
        JPanel jellySlugsCard = new JPanel();
        JPanel liquorWandsCard = new JPanel();
        JPanel pepImpsCard = new JPanel();
        JPanel pepToadsCard = new JPanel();
        JPanel pinkCocoIceCard = new JPanel();
        JPanel pixiePuffsCard = new JPanel();
        JPanel pumpkFizzCard = new JPanel();
        JPanel saltTaffeyCard = new JPanel();
        JPanel shockChocCard = new JPanel();
        JPanel skeleSweetsCard = new JPanel();
        JPanel spindleSpidersCard = new JPanel();
        JPanel sugarQuillsCard = new JPanel();
        JPanel sugarWingsCard = new JPanel();
        JPanel flossMintsCard = new JPanel();
        JPanel splintMintsCard = new JPanel();
        JPanel treacleFudgeCard = new JPanel();
        JPanel chocolatesCard = new JPanel();
        JPanel wizochocCard = new JPanel();

        //Adding the cards to the infoPanel
        infoPanel.add(startCard, "Start");
        infoPanel.add(acidPopsCard, "Acid Pops");
        infoPanel.add(batsBloodSoupCard, "Bat's Blood Soup");
        infoPanel.add(bertieBottsCard, "Bertie Bott's Every Flavour Beans");
        infoPanel.add(bloodPopsCard, "Blood-flavoured Lollipops");
        infoPanel.add(cauldronCakesCard, "Cauldron Cakes");
        infoPanel.add(charmChocCard, "Charm Choc");
        infoPanel.add(chocoballsCard, "Chocoballs");
        infoPanel.add(chocCauldronsCard, "Chocolate Cauldrons");
        infoPanel.add(chocFrogsCard, "Chocolate Frogs");
        infoPanel.add(chocSkeleCard, "Chocolate Skeletons");
        infoPanel.add(chocWands, "Chocolate Wands");
        infoPanel.add(chocolocoCard, "Choco-Loco");
        infoPanel.add(roachClustersCard, "Cockroach Clusters");
        infoPanel.add(nougatCard, "Nougat");
        infoPanel.add(crystalPineappleCard, "Crystallised Pineapple");
        infoPanel.add(droobleGumCard, "Drooble's Best Blowing Gum");
        infoPanel.add(explodeBonbonsCard, "Exploding Bonbons");
        infoPanel.add(toffeesCard, "Toffees");
        infoPanel.add(fizzWhizCard, "Fizzing Whizzbees");
        infoPanel.add(fudgeFliesCard, "Fudge Flies");
        infoPanel.add(iceMiceCard, "Ice Mice");
        infoPanel.add(jellySlugsCard, "Jelly Slugs");
        infoPanel.add(liquorWandsCard, "Liquourice Wands");
        infoPanel.add(pepImpsCard, "Pepper Imps");
        infoPanel.add(pepToadsCard, "Peppermint Toads");
        infoPanel.add(pinkCocoIceCard, "Pink Coconut Ice");
        infoPanel.add(pixiePuffsCard, "Pixie Puffs");
        infoPanel.add(pumpkFizzCard, "Pumpkin Fizz");
        infoPanel.add(saltTaffeyCard, "Salt Water Taffy");
        infoPanel.add(shockChocCard, "Shock-o-Choc");
        infoPanel.add(skeleSweetsCard, "Skeletal Sweets");
        infoPanel.add(spindleSpidersCard, "Splindle's Lick'O'Rish Spiders");
        infoPanel.add(sugarQuillsCard, "Sugar Quills");
        infoPanel.add(sugarWingsCard, "Sugared Butterfly Wings");
        infoPanel.add(flossMintsCard, "Toothflossing Stringmints");
        infoPanel.add(splintMintsCard, "Tooth-Splintering Strongmints");
        infoPanel.add(treacleFudgeCard, "Treacle Fudge");
        infoPanel.add(chocolatesCard, "Chocolates");
        infoPanel.add(wizochocCard, "Wizochoc");

        //startCard building
        JLabel startLbl = new JLabel("<html><center>Welcome to the Honeydukes Muggle Ordering System!<br />Please select from one of our products to the left to begin!</center></html>");
        startCard.add(startLbl, BorderLayout.CENTER);

        this.add(invntryPanel, BorderLayout.LINE_START);
        this.add(infoPanel, BorderLayout.CENTER);
        this.setVisible(true);
    }
}

---

我可以想出几个办法。首先，将candyList的引用设置为final

final JList candyList = new JList(candy);

这应该允许内部类查看列表。就个人而言，我不喜欢这种方法，但那只是我自己

您可以尝试的另一件事是通过事件对象引用列表

ListSelectionListener sl = new ListSelectionListener() {
    public void valueChanged(ListSelectionEvent e) {
        JList candyList = (JList)e.getSource();
        if (e.getValueIsAdjusting() == false) {
            CardLayout.show(infoPanel, (String)candyList.getSelectedValue());
        }
       }
    };

或者构造一个新的内部类，该类可以将列表作为参数传递给它

public class MyInnerListener implements ListSelectionListener {

    private JList list;

    public MyInnerListener(JList list) {

        this.list = list;

    }
    public void valueChanged(ListSelectionEvent e) {
        if (e.getValueIsAdjusting() == false) {
            CardLayout.show(infoPanel, (String)list.getSelectedValue());
        }
    }

}

---

只是一些想法；）

将infoPanel声明为final，然后尝试编译您还应该将

candyList

声明为final。您必须创建

CardLayout

的实例：

newcardlayout（）.show（infoPanel，（String）candyList.getSelectedValue（））。每当我尝试将其中任何一个设置为最终设置时，它都会说需要一个标识符。你知道为什么吗？我知道它可以是任何东西。非常好的主意，那些。它至少处理JList。我有点想“作弊”，只需在JList下面添加一个按钮即可切换当前卡。它将解决必须处理内部类之类的问题，至少是这样。
public class MyInnerListener implements ListSelectionListener {

    private JList list;

    public MyInnerListener(JList list) {

        this.list = list;

    }
    public void valueChanged(ListSelectionEvent e) {
        if (e.getValueIsAdjusting() == false) {
            CardLayout.show(infoPanel, (String)list.getSelectedValue());
        }
    }

}