What is the output(Generic Map)? : Questions « Utility Classes « SCJP

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

public class MainClass {
  public static void main(String[] args) {
    Map<ToDos, String> m = new HashMap<ToDos, String>();
    ToDos t1 = new ToDos("Monday");
    ToDos t2 = new ToDos("Monday");
    ToDos t3 = new ToDos("Tuesday");
    m.put(t1, "doLaundry");
    m.put(t2, "payBills");
    m.put(t3, "cleanAttic");
    System.out.println(m.size());
  }
}

class ToDos {
  String day;

  ToDos(String d) {
    day = d;
  }

  public boolean equals(Object o) {
    return ((ToDos) o).day == this.day;
  }
  // public int hashCode() { return 9; }
}