Computer scienceProgramming languagesJavaCode organizationObject-oriented programmingClass hierarchiesBuilding class hierarchies

Referencing subclass objects

Theory

Find incorrect assignments

Report a typo

You have a class hierarchy consisting of three classes:

class A { }

class B extends A { }

class C extends B { }

Choose all incorrect assignments.

A a1 = new A(); // (1)
A a2 = new C(); // (2)

B b1 = new B(); // (3)
B b2 = new A(); // (4)
B b3 = new C(); // (5)

C c1 = new B(); // (6)
C c2 = new C(); // (7)

Select one or more options from the list

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