第五次作业

import java.io.File;

import javax.swing.JList;




public class FileUtils {

    private static final File dir = null;
    private static Object String;
    /**
     * @param args
     * @throws IllegalAccessException 
     */
public static String[] listDirectory(File dir) throws IllegalAccessException{
    //判断File对象dir是否存在,使用File类的exists()方法
    if(!dir.exists()){
        //如果不存在,抛出异常
        throw new IllegalAccessException("目录" + dir +"不存在。");
    }
    //判断dir是否是目录,使用File类的isDirectory()方法
    if(!dir.isDirectory()){
        throw new IllegalArgumentException(dir + "不是目录");
    }
    
    //获得指定目录dir下的文件及子目录并输出(1.list();2.listFiles())
    
    //使用list()方法实现
    String[] fileNames = dir.list();
    for(String s : fileNames)
        System.out.println(s);

    //使用listFiles()方法实现只列出目录下的所有文件名称
    File[] files = dir.listFiles();
    return fileNames;
}

    public static void main(String[] args) {
        // TODO Auto-generated method stub
    try {
        FileUtils.listDirectory(new File("D:"));
    } catch (IllegalAccessException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
    
    

}

import javax.swing.*;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.*;
import java.io.File;

public class FileUtilsFrame {

    private static JLabel infoLabel;
    private static JSlider slider;
    private static JList list;
    private static ListModel fileName;
    private static JList fileList;

    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
    
    final JFrame frm = new JFrame("");
    frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    JList<String> jList = new JList<>(FileUtils.listDirectory(new File("D:")));
    
    frm.add(jList);
    
   JMenuBar mbar = new JMenuBar();
   frm.setJMenuBar(mbar);
    JMenu m1 = new JMenu("files");
    JMenu m2 = new JMenu("list");
    mbar.add(m1);
    mbar.add(m2);
  
    frm.setBounds(400, 200, 200, 300);
    frm.setVisible(true);
    
    }

    }