2- Overview of Collections Framework

Jun 20, 2026 07:45 · 3:08 · English · Whisper Turbo · 2 Puheenvuorot
Tämä transkripti päättyy 24 päiviä. Päivitys pysyvään säilytykseen →
Luennon hakemisto
Näyttää vain
0:03
S… Speaker 1 (2- Overview of Collections Framework)
Let's start this section by a brief overview of what we have in the collections framework.
0:07
S… Speaker 1 (2- Overview of Collections Framework)
So the green boxes you see here are interfaces and the blue
0:11
S… Speaker 1 (2- Overview of Collections Framework)
boxes are classes that implement these interfaces.
0:14
S… Speaker 1 (2- Overview of Collections Framework)
Now don't worry about memorizing any of these,
0:16
S… Speaker 1 (2- Overview of Collections Framework)
we're going to get back to this slide several times throughout this section.
0:19
S… Speaker 1 (2- Overview of Collections Framework)
So at the top of this hierarchy,
0:21
S… Speaker 1 (2- Overview of Collections Framework)
we have the iterable interface.
0:23
S… Speaker 1 (2- Overview of Collections Framework)
This interface represents an object that can be used in a for each
0:27
S… Speaker 1 (2- Overview of Collections Framework)
statement.
0:28
S… Speaker 1 (2- Overview of Collections Framework)
So if we implement this interface in our generic list class,
0:31
S… Speaker 1 (2- Overview of Collections Framework)
we'll be able to use it in a for each loop.
0:33
S… Speaker 1 (2- Overview of Collections Framework)
I'll show you how to do that later.
0:35
S… Speaker 1 (2- Overview of Collections Framework)
Below that we have the collection interface.
0:37
S… Speaker 1 (2- Overview of Collections Framework)
This interface extends the iterable interface and adds additional
0:42
S… Speaker 1 (2- Overview of Collections Framework)
functionality.
0:42
S… Speaker 1 (2- Overview of Collections Framework)
It represents an object that can act like a container or a collection
0:47
S… Speaker 1 (2- Overview of Collections Framework)
of objects.
0:47
S… Speaker 1 (2- Overview of Collections Framework)
Now here's a question for you.
0:49
S… Speaker 1 (2- Overview of Collections Framework)
What are the capabilities that we need in a collection?
0:52
S… Speaker 1 (2- Overview of Collections Framework)
we should be able to add an object to a collection,
0:54
S… Speaker 1 (2- Overview of Collections Framework)
we should be able to remove an object,
0:56
S… Speaker 1 (2- Overview of Collections Framework)
we should be able to check for the existence of an object and so on.
0:59
S… Speaker 1 (2- Overview of Collections Framework)
So these are the operations that the collection interface declares.
1:03
S… Speaker 1 (2- Overview of Collections Framework)
If you search for Java collection interface,
1:06
S… Speaker 1 (2- Overview of Collections Framework)
on this page,
1:08
S… Speaker 1 (2- Overview of Collections Framework)
you can see all the operations that this interface declares.
1:11
S… Speaker 2 (2- Overview of Collections Framework)
For example,
1:12
S… Speaker 1 (2- Overview of Collections Framework)
we have add for adding an object,
1:14
S… Speaker 1 (2- Overview of Collections Framework)
we have add all,
1:15
S… Speaker 1 (2- Overview of Collections Framework)
we have clear and so on.
1:17
S… Speaker 1 (2- Overview of Collections Framework)
Now, below this collection interface,
1:18
S… Speaker 1 (2- Overview of Collections Framework)
we have three sub -interfaces,
1:20
S… Speaker 2 (2- Overview of Collections Framework)
list,
1:21
S… Speaker 2 (2- Overview of Collections Framework)
queue,
1:22
S… Speaker 1 (2- Overview of Collections Framework)
and set.
1:22
S… Speaker 1 (2- Overview of Collections Framework)
Each of these again inherits all the capability declared in the collection
1:27
S… Speaker 1 (2- Overview of Collections Framework)
interface and add something extra.
1:29
S… Speaker 2 (2- Overview of Collections Framework)
For example,
1:30
S… Speaker 1 (2- Overview of Collections Framework)
the list interface allows us to work with an ordered collection and
1:34
S… Speaker 1 (2- Overview of Collections Framework)
access objects using their index,
1:36
S… Speaker 1 (2- Overview of Collections Framework)
just like how we can access an object by its index in an array.
1:39
S… Speaker 2 (2- Overview of Collections Framework)
Now,
1:40
S… Speaker 1 (2- Overview of Collections Framework)
we have different implementations of this interface in the collections framework.
1:43
S… Speaker 1 (2- Overview of Collections Framework)
The one that you would be using most of the time is the ArrayList class,
1:47
S… Speaker 1 (2- Overview of Collections Framework)
which is an implementation of a dynamic array.
1:49
S… Speaker 1 (2- Overview of Collections Framework)
So internally,
1:50
S… Speaker 1 (2- Overview of Collections Framework)
it uses an array to store objects.
1:53
S… Speaker 1 (2- Overview of Collections Framework)
If the array gets full,
1:54
S… Speaker 1 (2- Overview of Collections Framework)
it will automatically resize the array.
1:56
S… Speaker 1 (2- Overview of Collections Framework)
We have another implementation called linked list,
2:00
S… Speaker 1 (2- Overview of Collections Framework)
which is based on the linked list data structure.
2:02
S… Speaker 1 (2- Overview of Collections Framework)
The explanation of linked lists goes beyond the scope of this course.
2:06
S… Speaker 1 (2- Overview of Collections Framework)
I've covered them in detail in my data structures and algorithms course.
2:10
S… Speaker 1 (2- Overview of Collections Framework)
So we have two different implementations of the list interface.
2:13
S… Speaker 1 (2- Overview of Collections Framework)
Again,
2:13
S… Speaker 1 (2- Overview of Collections Framework)
most of the time you would be using the array list class.
2:16
S… Speaker 1 (2- Overview of Collections Framework)
The queue interface also extends the collection interface and provides additional
2:20
S… Speaker 1 (2- Overview of Collections Framework)
operations for working with a queue of objects.
2:23
S… Speaker 1 (2- Overview of Collections Framework)
We use queues in situations where we have a resource that can be shared
2:28
S… Speaker 1 (2- Overview of Collections Framework)
amongst many consumers.
2:29
S… Speaker 1 (2- Overview of Collections Framework)
A good example of this is the printer at your office.
2:32
S… Speaker 1 (2- Overview of Collections Framework)
Different people can print different papers at the same time,
2:35
S… Speaker 1 (2- Overview of Collections Framework)
but a printer is not going to be able to print them all simultaneously.
2:38
S… Speaker 1 (2- Overview of Collections Framework)
So each job should go in a queue.
2:40
S… Speaker 1 (2- Overview of Collections Framework)
The printer will then take these jobs one by one and process them.
2:45
S… Speaker 1 (2- Overview of Collections Framework)
Now in the collections framework,
2:46
S… Speaker 1 (2- Overview of Collections Framework)
the class that implements the queue interface is called priority queue.
2:50
S… Speaker 1 (2- Overview of Collections Framework)
We're going to look at that later in this section.
2:51
S… Speaker 1 (2- Overview of Collections Framework)
And finally,
2:52
S… Speaker 1 (2- Overview of Collections Framework)
we have the set interface which represents a collection without duplicates.
2:56
S… Speaker 1 (2- Overview of Collections Framework)
The class that implements this interface is called high set.
3:00
S… Speaker 1 (2- Overview of Collections Framework)
So that was a very basic overview.
3:02
S… Speaker 1 (2- Overview of Collections Framework)
Throughout this section,
3:03
S… Speaker 1 (2- Overview of Collections Framework)
we're going to explore each of these building blocks in detail.

Tämän selostuksen loi tekoäly (automaattinen puheentunnistus). Saattaa sisältää virheitä – tarkistaa alkuperäistä ääntä kriittiseen käyttöön. tekoälypolitiikka

❤️ Rakastatko STT.ai:tä? Kerro ystävillesi!
Yhteenveto
Klikkaa yhteenvetoa luodaksesi tekoälyn tiivistelmän tästä selostuksesta.
Yhteenvetona...
Kysy tekoälyltä tästä transcriptistä
Kysy mitään tästä selostuksesta – tekoäly löytää asiaan liittyviä osioita ja vastaa niihin.
Ota toinen asia puheeksi