Java adds line number styles to ReadLine extensions

In the use of Java streams, in the character buffer input stream, there is a way to read a row of data each time: ReadLine ();

Here, the simple inheritance method is used to extend it so that the ordinal is added before each line is returned

1 2Some packages that need to be imported3 ImportJava.io.BufferedReader;4 ImportJava.io.File;5 ImportJava.io.FileReader;6 Importjava.io.IOException;7 ImportJava.io.Reader;8 9 //use inherited methods to extend the ReadLine () method of the BufferedReader classTen  One //Customizing a class that inherits BufferedReader A classBufferedrlnextendsbufferedreader{ -     intCount = 0; -     //constructor method, using the parameters of the parent class the      PublicBufferedrln (Reader in) { -         Super(in);// -     } -      + @Override -      PublicString ReadLine ()throwsIOException { +         //Call the ReadLine () method of the parent class to return a row of data AString content =Super. ReadLine (); at         //set the style for the returned data (add line numbers here) -         if(Content = =NULL) { -             return NULL;//if empty, the data has been read out -         } -Content = count+ "" +content;//Add line number -count++; in         returncontent; -     } to } +  -  the  Public classReadLine { *      Public Static voidMain (string[] args)throwsIOException { $         //TODO auto-generated Method StubPanax NotoginsengFile File =NewFile ("C:\\users\\lx\\desktop\\io job. txt"); -      the readlineExt1 (file); +     }  A          the     //using a custom class Bufferedrln +      Public Static voidReadlineExt1 (File file)throwsioexception{ -          $FileReader FRD =Newfilereader (file); $         //the actual parameter FRD will be passed to the constructor in the custom. -Bufferedrln BFRD =NewBufferedrln (FRD); -         //reading Data theString string =NULL; -          while(String = Bfrd.readline ())! =NULL) {Wuyi System.out.println (string);  the         } -         //Close Resource Wu frd.close (); -     }  About  $ 

Java adds line number styles to ReadLine extensions