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New IO Duplicator

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; 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();     ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);     int bytesRead = 0;     while (bytesRead >= 0 || buffer.hasRemaining()) {       if (bytesRead != -1)         bytesRead = inChannel.read(buffer);       buffer.flip();       outChannel.write(buffer);       buffer.compact();     }     inChannel.close();     outChannel.close();   } }