please explain me the flow of this program along with the explanation of output..its displaying 0...and why not /uoooo (unicode)

public class ExampleonDatatypes { static int s; static String x; static float y; static char c; static double d; static long l; static boolean f; static byte b; public static void main(String args[]) {

    System.out.println(s);
    System.out.println(x);
    System.out.println(y);
    System.out.println(c);
    System.out.println(d);
    System.out.println(l);
    System.out.println(f);
    System.out.println(b);
}

}