XDemo.java

import java.util.stream.IntStream;

public class XDemo {

    public static void main(String[] args) {
        int r = 16;
        IntStream.rangeClosed(-r, r)
                .map(Math::abs)
                .peek(i -> IntStream.rangeClosed(-r, r)
                        .map(Math::abs)
                        // printing a kind of thick circle,
                        // thin circle and cross in the center
                        .mapToObj(j -> i == j && i < r/3 || // cross
                                // outer thick circle
                                Math.abs(i*i + j*j - r*r/1.3) < 4*r ||
                                // inner thin circle
                                Math.abs(i*i + j*j - r*r/4) < r
                                // cast to String
                                ? ""
                                // two random ASCII punctuation
                                // symbols: !"#$%&'()*+,-./
                                + (char) (33 + Math.random() * 15)
                                + (char) (33 + Math.random() * 15)
                                // two whitespaces
                                : "  ")
                        .forEach(System.out::print))
                .forEach(i -> System.out.println());
    }
}