Type Casting

[Somu]

Dear All

I encounterd a quetion related type casting.
Question is

class class1{}
class class2 extends class1{}
class class3 extends class3{}

A. class3’s parent class is class2, and class2’s parent class is class1.
B. class3’s parent class is class2, class2’s parent class is class1, and class1’s parent is Object.
C. class1’s parent class is class2, and class2’s parent class is class3.
D. class1’s parent class is class2, class2’s parent class is class3, and class3’s parent is Object.

Answer is A , but i don't know how (A) is correct

If any one know please explain me.

[poochi]

> class class1{}

By default , all classes are extends from Object. So , the answer is B

[Somu]

Dera poochi

Please tell me diff between class1 & class3.
From my knowledge
class1 & class3 both are subclass of object.
Is any benefit to drive a class by itself as class3.

[poochi]

> class class3 extends class3{}

you cant inherit like this. I thought it was a typing mistake.
It has to be like "class class3 extends class2{}" otherwise you will get
"Cyclic class inheritance" compilation error.