public class Switch {
    public static void main(String[] args) {
        CharSequence s = "some string";
        /*var res = switch (s) {
            case "AaAaAa" -> 20;
            case "AaAaBB" -> 30;
            case String y -> 40;
            case CharSequence cs -> 30;
        };*/

        var i = s instanceof String s2;
        //System.out.println(s2);

        if (!(s instanceof String s2)) {
            System.out.println(s2);
        } else {
            System.out.println(s2);
        }
    }
}