texteofdemo.java

java编程代码

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.PrintWriter;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 Makes numbered.txt the same as original.txt, but with each line numbered.
*/
public class TextEOFDemo
{
   public static void main(String[] args)
   {
      try
      {
         BufferedReader inputStream = 
               new BufferedReader(new FileReader("original.txt"));
         PrintWriter outputStream = 
               new PrintWriter(new FileOutputStream("numbered.txt"));

         int count = 0;
         String line = inputStream.readLine( );
         while (line != null)
         {
            count++;
            outputStream.println(count + " " + line);
            line = inputStream.readLine( );
          }
         inputStream.close( );
         outputStream.close( );
      }
      catch(FileNotFoundException e)
      {
         System.out.println("Problem opening files.");
      }
      catch(IOException e)
      {
         System.out.println("Error reading from original.txt.");
      }
   }
}