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Locking Copier

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.nio.channels.FileChannel; import java.nio.channels.FileLock; public class MainClass {   public static void main(String[] args) throws IOException {     FileInputStream inFile = new FileInputStream(args[0]);     FileOutputStream outFile = new FileOutputStream(args[1]);     FileChannel inChannel = inFile.getChannel();     FileChannel outChannel = outFile.getChannel();     FileLock outLock = outChannel.lock();     FileLock inLock = inChannel.lock(0, inChannel.size(), true);     inChannel.transferTo(0, inChannel.size(), outChannel);     outLock.release();     inLock.release();     inChannel.close();     outChannel.close();   } }