import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) throws IOException {
if (args.length < 2) {
System.err.println("Usage: java MainClass inFile1 inFile2... outFile");
return;
}
ByteBuffer[] buffers = new ByteBuffer[args.length - 1];
for (int i = 0; i < args.length - 1; i++) {
RandomAccessFile raf = new RandomAccessFile(args[i], "r");
FileChannel channel = raf.getChannel();
buffers[i] = channel.map(FileChannel.MapMode.READ_ONLY, 0, raf.length());
}
FileOutputStream outFile = new FileOutputStream(args[args.length - 1]);
FileChannel out = outFile.getChannel();
out.write(buffers);
out.close();
}
}