HashMap without hashCode

HashMapPersonWithoutHashCode.java

public class Person {
    private Integer id;
    private String name;

    public Person(Integer id, String name) {
        this.id = id;
        this.name = name;
    }
}

public static void main(String[] args) {
    Map<Person, Integer> map = new HashMap<>();
    map.put(new Person(1, "Alberto"), 35);
    map.put(new Person(2, "Ana"), 28);

    //more operations and in a place away from previous code...
    map.put(new Person(1, "Alberto"), 36);
    System.out.println(map.size());
}