import java.util.Map;
import java.util.HashMap;

public class CompositeMapsExample {
    public static void main(String[] args) {
        // Old and busted
        Map<String, Map<String, Object>> compositeMap = new HashMap<String, Map<String, Object>>();
        compositeMap.put("Jones", new HashMap<String, Object>());
        compositeMap.get("Jones").put("Jim", 5);

        System.out.println(compositeMap);

        // New hotness
        Map<Name, Object> compositeKey = new HashMap<Name, Object>();
        compositeKey.put(new Name("Jones", "Jim"), 5);

        System.out.println(compositeKey);
    }
}

class Name {
    public Name (String lastName, String firstName) {
        this.lastName = lastName;
        this.firstName = firstName;
    }

    public boolean equals(Object o) {
        if (o == null || o.getClass() != this.getClass())
            return false;
        return ((Name) o).lastName.equals(this.lastName) &&
               ((Name) o).firstName.equals(this.firstName);
    }

    public int hashCode() {
        return lastName.hashCode() + firstName.hashCode();
    }

    public String toString() {
        return lastName + ", " + firstName;
    }

    private final String lastName;
    private final String firstName;
}