Java question

[rose dune]

What is the difference between abstract and interface and why do you need it

[humble cliff]

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[minor spire]

you can only extend one abstract class but can implement as many interfaces as you like

https://www.baeldung.com/java-interface-vs-abstract-class

you can read more about it here

[rose dune]

[prisma jay]

It's also a relatively easy semantic question. Just ask yourself the following question, considering the classes extending/implementing the abstract class/interface: Is there a "is-a" relationship or are you trying to encapsulate/simplify/hide behinde/reduce to a functionality.
"is-a" => abstract class
reduction to a functionality => interface

[rose dune]

ohhh

oooo

thanks

[ocean plume]

Note: The abstract keyword is also used for methods which means "the body (code) of this method is provided by implementations/subclasses"

btw for questions like that: I highly recommend just trying it out and seeing what happens, that's how you really learn :)

[rose dune]