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List interface in Collection Framework

Ajay Singh Rathore
Greenhorn

Joined: Nov 20, 2007
Posts: 2
can anyone explain this syntax.

List<List<Integer>> table = new ArrayList<List<Integer>>();

what is the meaning of this syntax.
Santhi Bharath
Ranch Hand

Joined: Jun 03, 2008
Posts: 75
up to my knowledge that is list of integer lists.

tables list contains lists of integers


thanks and regards<br />Santhi Bharath<br />SCJP 5.0, SCWCD 5.0
Ankit Garg
Sheriff

Joined: Aug 03, 2008
Posts: 9293
    
  17

Hi Ajayr! Welcome to Javaranch.

Santhi is right. your reference variable table is a list of integer lists.

Lets take a more meaningful example to understand this-

List<List<Planet>> solarSystems = new List<List<Planet>>();

so here we have a list of solar systems, where each solar system has a list of planets. You can add elements to this list as follows

List<Planet> sun = new List<Planet>();
sunPlanets.add(new Planet("Mercury"));
sunPlanets.add(new Planet("Venus"));
sunPlanets.add(new Planet("Earth"));

solarSystems.add(sun);

List <Planet> dogStar = new List<Planet>();
dogStar.add(new Planet("MyPlanet1"));
dogStar.add(new Planet("MyPlanet2"));

solarSystems.add(dogStar);


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Rekha Srinath
Ranch Hand

Joined: Sep 13, 2008
Posts: 178
More than the theoretical explanation, the code looks more understanding...Thanks Ankit !!!
 
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