java 21+ silani ko'rsataymi ?

sealed interface PortResult permits Ok, Missing, NotNumeric, OutOfRange {}
record Ok(int port)           implements PortResult {}
record Missing()              implements PortResult {}
record NotNumeric(String str) implements PortResult {}
record OutOfRange(int value)  implements PortResult {}

PortResult parsePort(String str) {
    if (str.isEmpty()) return new Missing();
    int port;
    try {
        port = Integer.parseInt(str);
    } catch (NumberFormatException e) {
        return new NotNumeric(str);
    }
    if (port < 1 || port > 65535) return new OutOfRange(port);
    return new Ok(port);
}