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 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 
 public class Main {
 private static final int BSIZE = 1024;
 
 public static void main(String[] args) throws Exception {
 FileChannel in = new FileInputStream("source.txt").getChannel(), out = new FileOutputStream(
 "target.txt").getChannel();
 ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
 while (in.read(buffer) != -1) {
 buffer.flip();
 out.write(buffer);
 buffer.clear();
 }
 }
 }
 
 
 
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