Example:

public class Test {
    public static void main(String ... args) {
        System.out.println(test((Integer)1234));
    }

    static int test(Number n) {
        return switch (n) {
            case Integer in -> {
                yield 1;
            }
            default -> {
                yield 0;
            }
        };
    }
}

This will be the starting point.

https://github.com/openjdk/jdk/blob/8b16897b74cfdc3c2693e3ae7e05f3d8c6468ebe/src/hotspot/share/cds/aotConstantPoolResolver.cpp#L465-L489

The bootstrap method to check is java/lang/runtime/SwitchBootstraps::typeSwitch