ArrayList and List relationships and code examples-Java

Relationship

List is Java Interface, ArrayList is Java Class, and they all belong to the Java.util package.

The Java List is an ordered set (ordered collection), also known as a sequence (Sequence);

Java ArrayList is a variable-sized array implementation of the Java List Interface.

Both of these are in the JAVA collection framework location, as shown in:

Take a look at the Official document description:

Java.util

Interface list<e>

• Type Parameters:

E-the type of elements in this list

All superinterfaces:

Collection<e>, iterable<e>

All known implementing Classes:

Abstractlist, Abstractsequentiallist, ArrayList, AttributeList, Copyonwritearraylist, LinkedList, RoleList, Roleunresolvedlist, Stack, Vector

public interface list<e>

Extends collection<e>

An ordered collection (also known as a sequence).

Java.util

Class arraylist<e>

• Java.lang.Object
  • Java.util.abstractcollection<e>
    • Java.util.abstractlist<e>
      • Java.util.arraylist<e>

All implemented Interfaces:

Serializable, Cloneable, Iterable<e>, Collection<e>, List<e>, randomaccess

Direct known subclasses:

AttributeList, Rolelist, roleunresolvedlist

public class Arraylist<e>

Extends abstractlist<e>

Implements List<e>, Randomaccess, Cloneable, Serializable

Resizable-array implementation of the List interface.

Example

1. Create a new ArrayList object

New Arraylist<string> ();

2. Adding elements to them

Brands.add ("Jack Amber");

3. Complete Example

//Beerexpert.java, excerpted from Dawn Griffiths & David Griffiths, "Head first Android development",Importjava.util.ArrayList;Importjava.util.List; Public classBeerexpert {List<String>getbrands (String color) {List<String> brands =NewArraylist<string>(); if(Color.equals ("Amber") {Brands.add ("Jack Amber."); Brands.add ("Red Moose"); } Else{Brands.add ("Jail Pale Ale"); Brands.add ("Gout Stout"); }                returnbrands; }}

References

[1] Oracle Corporation. Class arraylist<e>-Java? Platform Standard Ed. 8 [OL]. Https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html

[2] Oracle Corporation. Interface list<e>-Java? Platform Standard Ed. 8 [OL]. Https://docs.oracle.com/javase/8/docs/api/java/util/List.html

[3] Stack Overflow Users. Type List vs type ArrayList in Java [OL]. Https://stackoverflow.com/questions/2279030/type-list-vs-type-arraylist-in-java

ArrayList and List relationships and code examples-Java