Java : List of Maps when type of values is ArrayList

Question

I'm working on a java project and i want to create a list of Maps that the type of keys is Character and the values are ArrayLists of Characters. I have written something like this :

List<Map<Character, ArrayList<Character>>>

but the eclipse says : Syntax error on token ">>>", VariableDeclarator expected after this token

How can i do it ? any idea ?

Instead of a List<Map<Character, ArrayList<Character>>> I'd write some classes representing your data. After all, Java is an OOP language. You'll get self describing and easy to maintain code. Right now, your heading into a mess. — jlordo
– jlordo, Commented Mar 25, 2013 at 18:47
can you include the whole line of code where you are declaring List<Map<Character, ArrayList<Character>>>? — amphibient
– amphibient, Commented Mar 25, 2013 at 18:51
I think the compiler error is just informaing you that you need to supply the name of the variable. — jahroy
– jahroy, Commented Mar 25, 2013 at 18:59

Reimeus · Accepted Answer · 2013-03-25 18:57:45Z

8

The compiler is expecting a variable name to comply with Java syntax:

List<Map<Character, List<Character>>> myList = 
                              new ArrayList<Map<Character, List<Character>>>();

edited Mar 25, 2013 at 18:57

answered Mar 25, 2013 at 18:45

Reimeus

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5 Comments

Sam I am says Reinstate Monica Over a year ago

I might +1 IF this turns out to be the actual issue

Nick Over a year ago

This is correct. You could also have List<Map<Character, ArrayList<Character>>> myList; and define myList later.

Kozet Over a year ago

Why i can't have an array of Maps ? (instead of using List)

jahroy Over a year ago

@Kozet - You could use an array of Maps, but it would be much better to use a list.

jahroy Over a year ago

You can also use List<Map<Character, List<Character>>> = new ArrayList<Map<Character, List<Character>>>();

Arun · Accepted Answer · 2013-03-25 18:49:40Z

0

List<Map<Character, ArrayList<Character>>> list ; should be given

see the screen shot below

enter image description here

answered Mar 25, 2013 at 18:49

Arun

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Comments

amphibient · Accepted Answer · 2013-03-25 18:50:11Z

0

You can declare a variable as an interface (e.g. List) but to create an instance, you must choose an implementation (e.g. ArrayList):

List<Map<Character, ArrayList<Character>>> myList = new ArrayList<Map<Character, ArrayList<Character>>>();

answered Mar 25, 2013 at 18:50

amphibient

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