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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