1019 Classroom Content

1  Packagetext;2 3 ImportJava.io.*;4 5 //text file Operation class6  Public classfile {7     8     PrivateString FileName;9     Ten      PublicString GetFileName () One     { A         returnFileName; -     } -     //Construction the     Privatefile file; -      -      Publicfile (String fileName) -     { +          This. FileName =FileName; -          +File =NewFile (fileName); A     } at          -         //Create a file -          Public voidCreate ()throwsIOException -         { -               -              in             if(!file.exists ())//If the file does not exist -             { to file.createnewfile (); +System.out.println ("File creation succeeded! "); -             } the             Else *             { $System.out.println ("File already exists! ");Panax Notoginseng             } -         } the         //Deleting Files +          Public voidDelete () A         { theFile File =NewFile (fileName); +              -             if(File.exists ())//If the file exists $             { $ File.delete (); -System.out.println ("Delete succeeded! "); -             } the             Else -             {WuyiSYSTEM.OUT.PRINTLN ("file does not exist!) "); the             } -         } Wu         //Modify Content -          Public voidEdit (String stredit)throwsIOException//the modifications are transferred in the form of parameters . About         { $             if(File.exists ()) -             { -FileWriter FW =NewFileWriter (file); -                  ABufferedWriter BFW =NewBufferedWriter (FW); +                  the Bfw.write (stredit); -                  $ bfw.close (); the             } the             Else the             { theSYSTEM.OUT.PRINTLN ("file does not exist!) "); -             } in         } the         //Append Content the          Public voidAddLine (String strLine)throwsIOException//Add new lines, and transfer content About         { the             if(File.exists ()) the             { theString str =readFile (); +                  -FileWriter FW =NewFileWriter (file); the                 BayiBufferedWriter BFW =NewBufferedWriter (FW); the                  the                 //bfw.newline (); -                  -Bfw.write (str+ "\ n" +strLine); the                  the bfw.close (); the             } the             Else -             { theSYSTEM.OUT.PRINTLN ("file does not exist!) "); the             } the         }94          PublicString ReadFile ()throwsIOException the         { theString RTN = ""; the             98             if(File.exists ()) About             { -FileReader FR =Newfilereader (file);101                 102BufferedReader br =NewBufferedReader (FR);103                 104String s = ""; the                 106                  while((s = br.readline ())! =NULL)107                 {108Rtn + = s + "\ n";109                 } the br.close ();111             } the             Else113             { theSYSTEM.OUT.PRINTLN ("file does not exist!) "); the             } the             returnRtn;117         }118}

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1019 Classroom Content