Reversing a File : BufferedReader « File « Java Tutorial

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;

public class ReverseLines {

  public static void main(String[] args) {
    try {
      BufferedReader input = new BufferedReader(new FileReader(args[0]));
      ArrayList list = new ArrayList();
      String line;
      while ((line = input.readLine()) != null) {
        list.add(line);
      }
      input.close();

      Collections.reverse(list);

      PrintWriter output = new PrintWriter(new BufferedWriter(new FileWriter(args[1])));
      for (Iterator i = list.iterator(); i.hasNext();) {
        output.println((String) i.next());
      }
      output.close();
    } catch (IOException e) {
      System.err.println(e);
    }
  }
}

11.31.BufferedReader
	11.31.1.	BufferedReader
	11.31.2.	Create BufferedReader from InputStreamReader
	11.31.3.	Create BufferedReader from FileReader
	11.31.4.	Read content of a file
	11.31.5.	Reading Text from a File
	11.31.6.	Reads a text file and displays it line by line.
	11.31.7.	Using BufferedReader to read input number from user
	11.31.8.	Call the static method PressAnykey to keep to DOS window open.
	11.31.9.	Create PrintWriter from BufferedWriter
	11.31.10.	Create BufferedReader from StringReader
	11.31.11.	Create BufferReader from InputStreamReader
	11.31.12.	Reversing a File