java learning - File IO exercises

1. Remove the comment

Design a method for removing Java annotation file

Renderings:

. 1  Package IOTest;
 2  
. 3  Import java.io.BufferedReader;
 . 4  Import java.io.File;
 . 5  Import java.io.FileReader;
 . 6  Import java.io.FileWriter;
 . 7  Import java.io.IOException;
 . 8  Import the java.io .PrintWriter;
 . 9  
10  public  class Test {
 . 11  
12 is      public  static  void PrintFile (file Newf) { // progressive-entered the print file object 
13 is          the try (the FileReader fr = new new the FileReader (Newf); the BufferedReader br =new BufferedReader(fr)) {
14             while (true) {
15                 String str = br.readLine();
16                 if (str == null)
17                     break;
18                 System.out.println(str);
19             }
20         } catch (IOException e) {
21             // TODO Auto-generated catch block
22             e.printStackTrace();
23         }
24     }
25 
26     public static voidmain (String [] args) {
 27  
28          File F = new new File ( "F.: Project \\ \\ \\ javastudy HelloWorld.java the src \\"); // original file F 
29          File Newf = new new File ( "F. : Project \\ \\ \\ src \\ HelloWorld2.java javastudy "); // delete contain" // "the newly created file after the line that Newf 
30  
31          System.out.println (" the original contents of the file are: " );
 32          PrintFile (F); // print the contents of the original document 
33 is          the try (the FileReader fr = new new the FileReader (F);
 34 is                  FileWriter FW = new new FileWriter (Newf);
 35  
36                 Br = the BufferedReader new new the BufferedReader (fr); // read each line to use the BufferedReader 
37 [                  the PrintWriter PW = new new the PrintWriter (FW);) { // written in each row use the PrintWriter
 38 is              // original file f, fr, br; new file Newf, FW, PW 
39              the while ( to true ) {
 40                  String STR = br.readLine ();
 41 is                  IF (STR == null )
 42 is                      BREAK ;
 43 is                  IF (str.contains ( "//")!) { / / contains annotations, not written, i.e., that the comment line containing "deleted" 
44                     pw.println (STR);
 45                  }
 46 is  
47              }
 48          } the catch (IOException E) {
 49              // the TODO Auto-Generated Block the catch 
50              e.printStackTrace ();
 51 is          }
 52 is          System.out.println ( "the new contents of the documents : " );
 53 is          PrintFile (Newf); // print file contents 
54      }
 55 }