Fifth time Java Job

Job One:

The file displays a list box.

The drop-down combo box is added, and the text locale color is red.

1Import javax.swing.*;2Import java.awt.*;3 import Java.io.File;4 5  Public classFileutil extends jframe{6 7     /**8 * @param args9      */Ten      One      Public StaticString listdirectory (File dir) throws illegalaccessexception{ A         if(!dir.exists ()) { -             Throw NewIllegalaccessexception ("Catalogue"+dir+"does not exist"); -         } the         if(!dir.isdirectory ()) {//Judging is not a directory -             Throw NewIllegalArgumentException (dir+"not a directory"); -         } -string[] FileName =dir.list ();  +String name =""; -          for(String a:filename) { +name=name+a+"\ n";} A         returnname; at         } -      -      Public Static voidMain (string[] args) { -         //TODO auto-generated Method Stub -JFrame frame=NewJFrame (); -JPanel Main_panel =NewJPanel (NewBorderLayout ()); inJLabel label =NewJLabel ("FileList"); - frame.setdefaultcloseoperation (jframe.exit_on_close); to         //frame.setlayout (null); +string[] Itme =Newstring[]{"Folder A","folder B"}; -JComboBox box=NewJComboBox (); the          for(intI=0; i<itme.length;i++){ * Box.additem (Itme[i]); $         }Panax NotoginsengBox.setenabled (true); -Box.seteditable (true); theBox.setmaximumrowcount (6); +Box.setbounds ( the, -, the, -); A              theFrame.setbounds ( -, -, -, $); +Frame.setvisible (true); -JTextArea Main_text =NewJTextArea (); $ Main_text.setbackground (color.red); $JScrollPane aa=NewJScrollPane (); - Aa.setviewportview (main_text); -Main_text.setenabled (false); the Main_panel.add (Box,borderlayout.north); - Main_panel.add (aa,borderlayout.center);Wuyi Main_panel.add (Label,borderlayout.south); the Frame.add (main_panel); -          Wu         Try { -String Str=fileutil.listdirectory (NewFile ("C:\\users\\woshinibaba\\desktop\\java Job 5\\soundplayer")); About Main_text.settext (str); $         } -         Catch(illegalaccessexception e) { -             //TODO auto-generated Catch block - e.printstacktrace (); A         } +          the  -          $Frame.setbounds ( -, $, $, $); theFrame.setvisible (true); the          the      the     } -}

Code effects:

Job 2:

Fifth time Java Job