Question

我有一个队列实现为链表。我想从另一个类中排序这个队列。两个类都在同一个包中。我的排序列表是在公共类上，我想把它放在公共场所，所以我可以制作一个GUI。我想我错过了什么，我不知道它是什么。有人可以帮助我。

这是我的完整代码：

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

public class Search extends JFrame {

    private JLabel      lblSearch;
    private JTextField  txtSearch;
    private JButton     btnSort, btnborrow, btnreturn, btnsearch;
    public JList        listbooks, returnbooks;
    public Object[]     books;
    private ListModel[] listmodel;

    private LinkedList          ll  = new LinkedList(); {
        ll.add("The Fault In Our Stars");
        ll.add("Solid Mensuration");
        ll.add("Analytic Geometry");
        ll.add("Engineering Mechanics");
        ll.add("Perks Of Being A Wallflower");
        ll.add("Reckless");
        ll.add("Paper Towns");
        ll.add("Stewart's Algebra And Trigonometry");
        ll.add("The Lost Hero");
        ll.add("The Son Of Neptune");
        ll.add("Harry Potter And The Sorcerer's Stone");
        ll.add("Paper Towns");
        ll.add("Looking For Alaska");
        ll.add("Principles Of Taxation");
        ll.add("Contemporary Physics");
        ll.add("The House Of Hades");
        ll.add("The Last Olympian");
        ll.add("An Imperial Affliction");
        ll.add("The Daily Bread");
        ll.add("Looking For Alaska");
        ll.add("The Lightning Thief");
        ll.add("Sociology Focus On The Philippines");
        ll.add("The Red Pyramid");
        ll.add("Demigod Diaries");
        ll.add("The Battle Of The Labyrinth");
        ll.add("Webster's Dictionary");
        ll.add("Strength Of Materials");
        ll.add("Discrete Mathematics");
        ll.add("The Serpent's Shadow");
        ll.add("Twilight");
        ll.add("Breaking Dawn");
        ll.add("Eclipse");
        ll.add("Diary Of A Wimpy Kid");
        ll.add("Electronic Devices And Circuit Theory");
        ll.add("The Princess And The Frog");
        ll.add("Fifty Shades Of Grey");
        ll.add("The Mark Of Athena");
        ll.add("The Throne Of Fire");
        ll.add("Fifty Shades Of Grey");
        ll.add("Divergent");
        ll.add("Data Structures And Algorithms");
        ll.add("Introduction To Operating System");
        ll.add("Integral Calculus");
        ll.add("Life And Works Of Rizal");
        ll.add("The Sea Of Monsters");
        ll.add("Insurgent");
        ll.add("Holy Bible");
    }

    public Search() {

        super("TIPQC-Library: SEARCH");
        setLayout(null);
        getContentPane().setBackground(Color.BLACK);

        txtSearch = new JTextField(30);
        txtSearch.setBounds(80, 100, 240, 30);
        add(txtSearch);

        btnsearch = new JButton("Search");
        btnsearch.setBounds(330, 100, 90, 28);
        add(btnsearch);

        DefaultListModel<Object> model = new DefaultListModel<Object>();
        for (Object element : ll)
            model.addElement(element);

        listbooks = new JList(model);
        listbooks.setBounds(80, 180, 350, 100);
        listbooks.setBackground(Color.YELLOW);
        listbooks.setForeground(Color.BLACK);
        listbooks.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        add(listbooks);

        JScrollPane tscroll = new JScrollPane(listbooks);
        tscroll.setBorder(null);
        tscroll.setBounds(80, 180, 350, 100);
        tscroll.setBackground(Color.YELLOW);
        tscroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        add(tscroll);

        btnSort = new JButton("Sort");
        btnSort.setBounds(90, 300, 80, 25);
        add(btnSort);

        btnreturn = new JButton("Return");
        btnreturn.setBounds(220, 300, 80, 25);
        add(btnreturn);

        btnborrow = new JButton("Borrow");
        btnborrow.setBounds(340, 300, 80, 25);
        add(btnborrow);

        returnbooks = new JList();
        returnbooks.setBounds(80, 380, 350, 100);
        returnbooks.setBackground(Color.YELLOW);
        returnbooks.setForeground(Color.BLACK);
        returnbooks.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        add(returnbooks);

        ActionListener listener = new ButtonListener();
        btnborrow.addActionListener(listener);
        btnSort.addActionListener(listener);

    }

    public class ButtonListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {

            Object source = e.getSource();
            if (source == btnborrow)
            {
                Object removed;
                DefaultListModel model = (DefaultListModel) listbooks.getModel();
                int selectedIndex = listbooks.getSelectedIndex();
                if (selectedIndex != -1) {
                    removed = model.remove(selectedIndex);
                }
            }

            if (source == btnSort) {

                Collections.sort(ll);

                ListIterator liter = ll.listIterator();
                Collections.sort(ll);
                liter = ll.listIterator();
                while (liter.hasNext())
                    System.out.println(liter.next());
            }

        }

    }

    public void run() {

        setSize(500, 500);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);
    }

    public static void main(String[] args) {
        Search log = new Search();
        log.run();
    }
}

Answer 1

你的意思是，就像在GUI中显示排序列表一样？

                Collections.sort(ll);

                ListIterator liter = ll.listIterator();
                Collections.sort(ll);
                liter = ll.listIterator();

                DefaultListModel model = (DefaultListModel) listbooks.getModel();
                model.clear();
                for (Object element : ll)
                    model.addElement(element);
                //while (liter.hasNext())
                //  System.out.println(liter.next());

在java中实现从public class到public的变量

1 个答案: