Segitiga and Lingkaran class are child class from Bidang class (as parent class). Bidang class has association relationship with Warna class. This association is one direction that means Bidang class has a Warna's type attribute. First, we have to create Warna class:
create type warna as object(
r number(3),
b number(3),
g number(3),
member function getWarna return varchar
);
/
create type body warna as
member function getWarna return varchar is
begin
return 'Red=' || to_char(self.r) || ', Blue=' || to_char(self.b) || ', Green=' || to_char(self.g);
end;
end;
/Warna class has 3 attributes, i.e. r for Red, b for Blue and g for Green, and 1 operation that will return a varchar for the color. Now, we can create Bidang that will have an attribute as an object for Warna class.
create type Bidang as object(
x number(3),
y number(3),
color warna,
member function getLuas return number,
member function getKeliling return number
) not final;
/
create type body Bidang as
member function getLuas return number is
begin
return 0;
end;
member function getKeliling return number is
begin
return 0;
end;
end;
/
