第五次作业

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Toolkit; import java.io.File; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.border.EmptyBorder;   public class file{  

public static void listenDirectory(File dir) throws IllegalAccessException{

 if(!dir.exists()){

 throw new IllegalAccessException("目录"+dir+"不存在。");  }

if(!dir.isDirectory()){  throw new IllegalArgumentException(dir+"不是目录");  }

String[] fileNames = dir.list();  JList fileList = new JList(fileNames);  

 JFrame frm = new JFrame();  frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 JPanel contentPane = new JPanel();  contentPane.setBorder(new EmptyBorder(6, 10, 10, 10)); contentPane.setLayout(new BorderLayout(5, 5));  

JPanel pane = new JPanel();  pane.setLayout(new BorderLayout(8, 8));

 fileList.setForeground(Color.blue);  fileList.setBackground(Color.BLACK);  fileList.setSelectionBackground(Color.gray);  fileList.setSelectionForeground(Color.orange);

 JScrollPane scrollPane = new JScrollPane(fileList);  scrollPane.setColumnHeaderView(new JLabel("File lists"));

 pane.add(scrollPane, BorderLayout.CENTER);  contentPane.add(pane, BorderLayout.CENTER);

 frm.add(contentPane);

 frm.setBounds(500,300,300,400);  frm.setVisible(true);  }   public static void main(String[] args) {

 try {  file.listenDirectory(new File("E:\\")) ;  } catch (IllegalAccessException e) {

 e.printStackTrace();  }   } }