Just adding too, I think some of the switch statement example code is wrong:

    Object obj = 123L;
    String formatted = switch (obj) {
        case Integer i -> String.format("int %d", i);
        case Long l    -> String.format("long %d", l);
        case Double d  -> String.format("double %f", d);
        case String s  -> String.format("String %s", s);
        default        -> o.toString();
    };

Unless I'm not understanding something, the default statement should be `obj.toString()` as `o` isn't defined.