import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) {
File aFile = new File("primes.txt");
FileInputStream inFile = null;
try {
inFile = new FileInputStream(aFile);
} catch (FileNotFoundException e) {
e.printStackTrace(System.err);
}
FileChannel inChannel = inFile.getChannel();
try {
ByteBuffer lengthBuf = ByteBuffer.allocate(8);
while (true) {
if (inChannel.read(lengthBuf) == -1){
break;
}
lengthBuf.flip();
int strLength = (int) lengthBuf.getDouble();
ByteBuffer buf = ByteBuffer.allocate(2 * strLength + 8);
if (inChannel.read(buf) == -1) {
break;
}
buf.flip();
byte[] strChars = new byte[2 * strLength];
buf.get(strChars);
System.out.println(strLength);
System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
System.out.println(buf.getLong());
lengthBuf.clear();
}
inFile.close();
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
}