Java Text File Line Count numberOfLines(File file)

Description

number Of Lines

License

Open Source License

Parameter

Parameter	Description
file	the file to read the line numbers from

Exception

Parameter	Description
IOException	low level file error

Return

Number of lines in file

Declaration

public static int numberOfLines(File file) throws IOException 

Method Source Code

//package com.java2s;
/*//from w  w w .j  a v a  2s  .  c  om
 * FileHelpers.java
 *
 * BEAST: Bayesian Evolutionary Analysis by Sampling Trees
 * Copyright (C) 2014 BEAST Developers
 *
 * BEAST is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * BEAST is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with BEAST.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.File;

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.RandomAccessFile;

public class Main {
    /**
     * @param file the file to read the line numbers from
     * @return Number of lines in file
     * @throws IOException low level file error
     */
    public static int numberOfLines(File file) throws IOException {
        RandomAccessFile randFile = new RandomAccessFile(file, "r");
        long lastRec = randFile.length();
        randFile.close();
        FileReader fileRead = new FileReader(file);
        LineNumberReader lineRead = new LineNumberReader(fileRead);
        lineRead.skip(lastRec);
        int count = lineRead.getLineNumber() - 1;
        fileRead.close();
        lineRead.close();
        return count;
    }
}