I need help with my homework I need to write this diagram in java, how do I do it? I will attach what I have.

Volunteer Class Diagram Volunteer - firstName : String - lastName : String - startDate: LocalDate - volunteer Hours : double + DEFAULT FIRST NAME: String = "first name not assigned" + DEFAULT_LAST_NAME: String = "last name not assigned" + DEFAULT_START_DATE : LocalDate = today's date + DEFAULT HOURS: double = 0 + Volunteer (firstname: String, lastname: String, start: LocalDate, hours: double) + Volunteer) + Volunteer (firstname: String, lastname: String) + update VolunteerHours (hours: double): void + getFirstName(): String +setFirstName (newFName: String): void + getLastName(): String + setLastName (newlName: String): void + getStartDate(): LocalDate + setStartDate (newStartDate: LocalDate): void + setStartDate (newYr: int, newMonth: int, newDay:int) : void + getVolunteer Hours(): double + setVolunteer Hours (newHours: double): void + toString(): String