import java.io.*;
import java.util.*;

public class LS {

    public static void main(String[] args) throws Exception {
        try {
            // Write lambdas out
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(baos);

            write(out, HashMap::new );
            out.flush();
            out.close();

            // Read them back
            ByteArrayInputStream bais =
                new ByteArrayInputStream(baos.toByteArray());
            ObjectInputStream in = new ObjectInputStream(bais);
            readIt(in);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }
    }

    static void write(ObjectOutput out, LSI lamb) throws IOException {
        out.writeObject(lamb);
    }

    static void readIt(ObjectInputStream in)  throws IOException, ClassNotFoundException {
        LSI ls = (LSI) in.readObject();
        Map result = ls.convert();
        System.out.printf("Result: %s\n", result.getClass());
    }
}

interface LSI extends Serializable {
    Map convert();
}