[hardwired]

Code:

import java.util.*;

public class GroupTest {
    private Map<String, Person> record;

    public GroupTest() {
        record = new TreeMap<String, Person>();
    }

    public GroupTest(GroupTest group) {
        record = new TreeMap<String, Person>();
        // The for-each construct works like an Iterator.
        // The right argument in the for-each construct
        // should be an array or List.
        // What is group.record?
        System.out.println("group.record = " +
                            group.record.getClass().getName());
        // Try using the keySet.
        for (String key : group.record.keySet()) {
            Person person = group.record.get(key);
            this.record.put(key, person);
        }
        // An alternative.
//        record.putAll(group.record);
    }

    public static void main(String[] args) {
        String[] names = { "Sue", "John", "Linda" };
        GroupTest test = new GroupTest();
        for(String s : names)
            test.record.put(s, new Person(s));
        System.out.println("test = " + test.record);
        GroupTest defensiveCopy = new GroupTest(test);
        System.out.println("defensiveCopy = " + defensiveCopy.record);
    }
}

class Person {
    String name;

    Person(String name) { this.name = name; }
    public String getName() { return name; }
    public String toString() {
        return "Person[name:" + name + "]";
    }
}