Hello I was wondering If someone can help me understand this concept in Java. Is it similar and or another form of inheritance? Can you use the provided example to make a quick example for me to follow with?

EXAMPLE:

Public class Zoo$\{$

$//$Zoo class members $($instance vars, constructors, setter$/$getters$,$ etc.$)$

$\}$

Public class Animal$\{$

Zoo animal $=$ new Zoo$()$; $//$instance var of Zoo

$//$ Animal class members $($instance vars, constructors, setters$/$getters$,$ etc.$)$

$\}$

All I really know is that Animal class $($second class$)$ has field type from class Zoo$($First defined class$),$ but when I read about inheritance usually I see the implements or extends method so what exactly is happening here? Thank you in advance for your help!