Főnök f = new Alk(...);
f.beosztSzama



class ArrayListInt
class ArrayListDouble
class ArrayListString

class ArrayList<T>



new ArrayList<Integer>();


boolean
char
short < int < float < double
long
float
double

void f(double d)
void f(double d, int i)

f(123);
f(123.0);

Alk a;
if (rand())
    a = new Alk();
else
    a = new Fon();

// Object a;  ====> forditasi hiba
a.fizetestNovel();   --------> (Alk.fizNov)
a.fizetestNovel();   --------> (Fon.fizNov)