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copied!<p>Reading and writing the files with Java can be just as fast. You can use <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/channels/FileChannel.html" rel="noreferrer">FileChannels</a>. As for comparing the files, obviously this will take a lot of time comparing byte to byte Here's an example using FileChannels and ByteBuffers (could be further optimized):</p> <pre><code>public static boolean compare(String firstPath, String secondPath, final int BUFFER_SIZE) throws IOException { FileChannel firstIn = null, secondIn = null; try { firstIn = new FileInputStream(firstPath).getChannel(); secondIn = new FileInputStream(secondPath).getChannel(); if (firstIn.size() != secondIn.size()) return false; ByteBuffer firstBuffer = ByteBuffer.allocateDirect(BUFFER_SIZE); ByteBuffer secondBuffer = ByteBuffer.allocateDirect(BUFFER_SIZE); int firstRead, secondRead; while (firstIn.position() < firstIn.size()) { firstRead = firstIn.read(firstBuffer); secondRead = secondIn.read(secondBuffer); if (firstRead != secondRead) return false; if (!buffersEqual(firstBuffer, secondBuffer, firstRead)) return false; } return true; } finally { if (firstIn != null) firstIn.close(); if (secondIn != null) firstIn.close(); } } private static boolean buffersEqual(ByteBuffer first, ByteBuffer second, final int length) { if (first.limit() != second.limit()) return false; if (length > first.limit()) return false; first.rewind(); second.rewind(); for (int i=0; i<length; i++) if (first.get() != second.get()) return false; return true; } </code></pre>

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