Here you can find the source of readLong(RandomAccessFile raFile)
public static long readLong(RandomAccessFile raFile) throws IOException
//package com.java2s; /*//from w w w. ja v a 2 s. c o m * #%L * fast-persistent-queue * %% * Copyright (C) 2014 btoddb.com * %% * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * #L% */ import java.io.EOFException; import java.io.IOException; import java.io.RandomAccessFile; import java.nio.ByteBuffer; public class Main { public static long readLong(RandomAccessFile raFile) throws IOException { byte[] theBytes = new byte[8]; int count = raFile.read(theBytes); if (8 == count) { return ByteBuffer.wrap(theBytes).getLong(); } else { throw new EOFException("not enough data to satisfy read of long value"); } } }