OO programming about state

This is my professor's assignment for oo programming. But I found that the marital status can be an variable in the Person class, how can I achieve this with two classes?

Assume people can have marital status: single, married, widow, divorced. Create a state OODP (i.e., Java, JavaScript, C++, Python, or Ruby) that deal with people's marital status. You will have at least two classes: Person, and Marital State. Make sure the following rules are followed: single->married married-> divorced | widow divorced -> married widow -> married create a Client class to test your program. Make sure you test valid and invalid change of marital status.
The assignment page

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These are my codes:

public class AssignmentOOP {
    public static void main(String[] args) {
        Person p1 = new Person("p1");
        Person p2 = new Person("p2");
        Person p3 = new Person("p3");
        p1.PrintMaritalStatus();
        p2.PrintMaritalStatus();
        p3.PrintMaritalStatus();
        p1.GetMarried(p2);
        p1.GetMarried(p3);
        p2.Died();
        p1.GetMarried(p3);
    }
}

class Person {
    String maritalstatus;
    boolean mateIsAlive;
    Person mate;
    String name;

    Person(String name1) {
        maritalstatus = "single";
        mate = null;
        name = name1;
    }

    void GetMarried(Person mate) {
        if(this.maritalstatus.equals("married")|| mate.maritalstatus.equals("married"))
        {
            System.out.println("Marital status error! At least one of you are married");
            return;
        } else {
            this.maritalstatus = "married";
            this.mate = mate;
            mate.maritalstatus = "married";
            mate.mate = this;
            System.out.println("Congratulations!!! " + this.name + " and " + mate.name + " are married!");
        }
    }

    void GetDivorced(Person mate) {
        if(this.maritalstatus.equals("married") && this.mate == mate) {
            maritalstatus = "divorced";
            System.out.println(this.name+" and "+mate.name+" are getting divorced.");
        }else if(this.maritalstatus.equals("single")) {
            System.out.println("You are not married and you cannot get divorced before getting married");
        }else if(maritalstatus.equals("widow")) {
            System.out.println("Your marital status is widow, you cannot get divorced.");
        }
    }

    void Died() {
        this.maritalstatus = "dead";
        this.mate.maritalstatus = "widow";
        System.out.println("Sorry for your loss, " + this.mate.name + " marital status is widow.");
    }

    void PrintMaritalStatus() {
        System.out.println(this.name + " marital status is " + this.maritalstatus);
    }
}