Primitives datatypes

The current object is represented by the this keywords. An access to an attribute or the called of an operation is then expressed by this.attribute or this.operation() ; thus, an expression such as attribute=value; is translated into this.attribute=value;

3. Improvement: this keyword

public class Person {
  private Date birthdate;
  public Person(Date birthdate)            { this.setBirthDate(birthdate); }
  public void setBirthDate(Date birthdate) { this.birthdate = birthdate;   }
  public Date getBirthDate()               { return this.birthdate;        }
}

4. As an exercicse, how to extend Persons with the following characteristics ?

• 'weight', 'height' ? => float/Float
• 'married' ? => boolean/Boolean
• 'name' ? => String