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Collections and Generics

Question : 49 of 53

Marks: +1, -0

Given:

import java.util.*;
public class Group extends HashSet < Person > {
  public static void main(String[] args) {
   Group g = new Group();
   g.add(new Person("Hans"));
   g.add(new Person("Lotte"));
   g.add(new Person("Jane"));
   g.add(new Person("Hans"));
   g.add(new Person("Jane"));
   System.out.println("Total: " + g.size());
  }
  public boolean add(Object o) {
   System.out.println("Adding: " + o);
   return super.add(o);
  }
}
class Person {
  private final String name;
  public Person(String name) { this.name = name; }
  public String toString() { return name; }
}

Which of the following occur at least once when the code is compiled and run?(Choose all that apply.)

Adding Hans
Adding Lotte
Adding Jane
Total: 3
Total: 5
The code does not compile.
An exception is thrown at runtime.

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