Mega Code Archive
List of lines in a file with BufferedReader
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/*
* 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() / assumedLineLength) * 2);
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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