Java Learning Notes (v)

Import Java.awt.BorderLayout;
Import Java.awt.Color;
Import Java.io.File;

Import Javax.swing.JComboBox;
Import Javax.swing.JFrame;
Import Javax.swing.JPanel;
Import Javax.swing.JScrollPane;
Import Javax.swing.JTextArea;

public class FileUtils {
/**

• lists the names of all files or directories in the specified folder (directory)
• @param the folder (directory) specified by the Dir file type
• @return
• @throws illegalaccess Exception
  /
  public static String listdirectory (File dir) throws illegalaccessexception{
  // Determines whether the file and directory associated with DIR exists
  if (!dir.exists ()) {
  ///If it does not exist, throws an exception
  throw new Illegalaccessexception ("directory" + dir + "does not exist.) ");
  }
  //Determine if DIR is associated with a directory
  if (!dir.isdirectory ()) {
  throw new illegalaccessexception (dir + "not Directory");
  }
  / Gets the name of all files and folders under
• current directory (dir) by invoking the list () method with the passed-in file Object dir.
  */
  string[] files = dir.list ();
  String m = "";
  for (String a:files) {
  m=m+a+ "\ n";}
  return m;
  }
  /**
• @param args
  */
  public static void Main (string[] args) {
  //TODO auto-generated method stub
  JFrame frame=new JFrame ();
  JPanel main_panel =new JPanel (New BorderLayout ());
  Frame.setdefaultcloseoperation (jframe.exit_on_close);

String[] Itme = {". gif", ". bmp"};
JComboBox frm=new JComboBox (itme);
Frm.setenabled (TRUE);
Frm.seteditable (TRUE);
Frm.setmaximumrowcount (5);
Frm.setbounds (230,30,130,25);

Frame.setbounds (300,200,350,300);
Frame.setvisible (TRUE);
JTextArea main_text =new JTextArea ();
Main_text.setbackground (Color.White);
JScrollPane z=new JScrollPane ();
Z.setviewportview (Main_text);
Main_text.setenabled (FALSE);
Main_panel.add (Frm,borderlayout.north);
Main_panel.add (Z,borderlayout.center);
Frame.add (Main_panel);

try {
String str = fileutils.listdirectory (new File ("D:\FileUtils"));
Main_text.settext (str);
} catch (Illegalaccessexception e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
}

Java Learning Notes (v)