Java list vs arraylist

[thosekidds]

I love you sir, the minute you showed that it could be any kind of list when using the interface, the lightbulb went off. Thank you!

[aquilhall]

i think im finally starting to get it...so ArrayList IMPLEMENTS the List interface

[robertli]

Thanks. first video that I found about this topic and it acutally helped me!

[shreekarshetti]

Still not clear.. When is it useful to use the statement
ArrayList a1=new ArrayList() ;
and
List a2=new ArrayList() ;

[RichieRussell]

Great video! Very well explained! Keep it up!

[amitray]

thanks for your video. nicely explained. I have one question, why defining an object as an array list instead of list interface is bad?

[harshag]

Thanks for the simple and brilliant explanation.

[wesosdequeso]

What is weird about this and I just noticed watching this, is that you are creating an instance for an interface with a class instance.

Checking documentation found that:
List(interface) extends (Collection(interface) extends Iteratable(interface))
and
ArrayList(class) extends (AbstractList(class) extends (AbstractCollection(class) implements (Collection(interface) extends Iteratable(interface))))

And the only thing they have in common is the implementation of the Collection interface. Is this an example of inheritance? I knew about inheritance via the extends mechanism. But inheritance via interface implementation doesn't make much sense to me. Maybe I'm missing something, never thought about implementing inheritance this way before.

[beachwave]

finished my first java course now im onto data structures and am forced to fill in my gaps that i didnt learn in the prerequisite course!

[sidikicamara]

thanks, just came accross what i was looking for

[andrewp.]

Thank you so much! Simple and to the point :)

[rashidibrahim]

So list is like map as hashmap is like arraylist

[msalam]

why do some people use : =new ArrayList<Integer>(); //when defining a new list. is the Integer neccessary

[sweetandsourapple]

So what kind of list ist int [] {1, 2, 3} ? It's not an ArrayList or a LinkedList... so what is it and how is it different from an ArrayList?

[bfjohnmark]

I just want a list of class of list of array list

[LucasRock]

Esta explicación es muy buena, Saludos desde Argentian, I know you did not understand anything because you don't talk spanish ha ha ha ha.