Computer scienceProgramming languagesJavaCode organizationObject-oriented programmingClass hierarchiesBuilding class hierarchies

Inheritance

Theory

Find the same hierarchy

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Here is a picture that shows a class hierarchy.

class hierarchy

Note. The arrow is directed from a subclass to the base class. The base class is underlined.

Which of the following represents the same hierarchy?

a)

class A { }

class B extends A { }

class C extends A { }

class D extends A { }

b)

class A { }

class B extends A { }

class C extends A { }

class D extends B { }

c)

class A { }

class B extends A { }

class C extends B { }

class D extends B { }

d)

class A { }

class B { }

class C extends B { }

class D extends B { }
Select one option from the list
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