List of lines in a file with BufferedReader : BufferedReader « File Input Output « Java

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Java » File Input Output » BufferedReader 




List of lines in a file with BufferedReader
   

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class FileList {
  public static void main(String[] args) {
    final int assumedLineLength = 50;
    File file = new File(args[0]);
    List<String> fileList = new ArrayList<String>((int) (file.length() / assumedLineLength2);
    BufferedReader reader = null;
    int lineCount = 0;
    try {
      reader = new BufferedReader(new FileReader(file));
      for (String line = reader.readLine(); line != null; line = reader.readLine()) {
        fileList.add(line);
        lineCount++;
      }
    catch (IOException e) {
      System.err.format("Could not read %s: %s%n", file, e);
      System.exit(1);
    finally {
      if (reader != null) {
        try {
          reader.close();
        catch (IOException e) {
        }
      }
    }
    int repeats = Integer.parseInt(args[1]);
    Random random = new Random();
    for (int i = 0; i < repeats; i++) {
      System.out.format("%d: %s%n", i, fileList.get(random.nextInt(lineCount - 1)));
    }
  }
}

   
    
    
  














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