// Written with System.out so that JDK 21 can compile it: the ONLY thing wrong with it on 21 is the statement before super(...).
public class OnJdk21 {
    static class Person { Person(String n) {} }
    static class Employee extends Person {
        Employee(String name, int salary) {
            if (salary < 0) throw new IllegalArgumentException("negative");
            super(name.strip());
        }
    }
    public static void main(String[] args) {
        new Employee(" a ", 1);
        System.out.println("constructed");
    }
}