import java.util.Vector;public class Person {    Person father;    Person mother;    Vector children;    private String name;    public Person(String name) {        this.name = name;        mother = father = null;        children = new Vector();    }    /**    *   Link together all members of a family.    *    *   @param pa the father    *   @param ma the mother    *   @param kids the children    */    public static void linkFamily(Person pa,                                  Person ma,                                  Person[] kids) {        int len = kids.length;        Person kid = null;        for (int i = 0; i < len; i++) {            kid = kids[i];            pa.children.addElement(kid);            ma.children.addElement(kid);            kid.father = pa;            kid.mother = ma;        }    }/// getter methods ///////////////////////////////////    public String toString() { return name; }    public String getName() { return name; }    public Person getFather() { return father; }    public Person getMother() { return mother; }    public int getChildCount() { return children.size(); }    public Person getChildAt(int i) {        return (Person)children.elementAt(i);    }    public int getIndexOfChild(Person kid) {        return children.indexOf(kid);    }}