java swing中对于JList的使用（二）

package com.robert;

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

/**
 * Created by IntelliJ IDEA.
 * User: Administrator
 * Date: 11-11-12
 * Time: 下午8:53
 * To change this template use File | Settings | File Templates.
 */
public class LongListTest {

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new LongListTestFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

package com.robert;

import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.xml.soap.Text;
import java.awt.*;

/**
 * Created by IntelliJ IDEA.
 * User: Administrator
 * Date: 11-11-12
 * Time: 下午8:55
 * To change this template use File | Settings | File Templates.
 */
public class LongListTestFrame extends JFrame{

    private static final int DEFAULT_WIDTH = 400;
    private static final int DEFAULT_HEIGHT = 300;
    private JList wordList;
    private JLabel label;
    private String prefix = "The quick brown ";
    private String suffix = " jump over the lazy dog.";

    public LongListTestFrame()
    {
        setTitle("LongListTest");
        setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);

        wordList = new JList(new WordListModel(3));
        wordList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        wordList.setPrototypeCellValue("www");
        JScrollPane scrollPane = new JScrollPane(wordList);

        JPanel p = new JPanel();
        p.add(scrollPane);
        wordList.addListSelectionListener(new ListSelectionListener() {
            public void valueChanged(ListSelectionEvent e) {
                StringBuilder word = (StringBuilder)wordList.getSelectedValue();
                setSubject(word.toString());
            }
        });

        Container contentPane = getContentPane();
        contentPane.add(p,BorderLayout.NORTH);
        label = new JLabel(prefix + suffix);
        contentPane.add(label, BorderLayout.CENTER);
        setSubject("FOX");
    }

    public void setSubject(String word)
    {
        StringBuilder text = new StringBuilder(prefix);
        text.append(word);
        text.append(suffix);
        label.setText(text.toString());
    }
}

package com.robert;

import com.sun.org.apache.bcel.internal.generic.LASTORE;

import javax.swing.*;

/**
 * Created by IntelliJ IDEA.
 * User: Administrator
 * Date: 11-11-12
 * Time: 下午9:03
 * To change this template use File | Settings | File Templates.
 */
public class WordListModel extends AbstractListModel {

    private int length;
    public static final char FIRST = 'a';
    public static final char LAST = 'z';

    public WordListModel(int n)
    {
        length = n;
    }

    public int getSize()
    {
        return (int)Math.pow(LAST - FIRST + 1,length);
    }

    public Object getElementAt(int n)
    {
        StringBuilder r = new StringBuilder();

        for(int i = 0; i < length; i++)
        {
            char c = (char)(FIRST + n % (LAST - FIRST + 1));
            r.insert(0, c);
            n = n / (LAST - FIRST + 1);
        }
        return r;
    }

}