Java: Adding new element to List<String>

Question

I have the following code:

public void parseAttribs(String attribs){

   //attribs is a comma separated list
   //we are making a List from attribs by splitting the string at the commas

   List<String> attributes = Arrays.asList(attribs.split("\\s*,\\s*"));

   //when I try to add an element to the attributes List if fails
   attributes.add("an element");

I've found this Unable to add a String to an ArrayList: "misplaced construct(s)" and tried to create a sub-class but I had to pass the List to the subclass as well and it still didn't work.

Could anyone please shed some light on this?

Many thanks

Thanks Reimeus and Rangi Lin. It works with your suggestion. — L4zl0w
– L4zl0w, Commented Mar 11, 2013 at 15:06

Reimeus · Accepted Answer · 2013-04-29 02:49:48Z

9

Arrays.asList returns a fixed-sizeList. You could use

new ArrayList<String>(Arrays.asList(...)))

This will give you a List where elements can be added.

edited Apr 29, 2013 at 2:49

answered Mar 11, 2013 at 13:44

Reimeus

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Rangi Lin · Accepted Answer · 2013-03-11 13:43:55Z

6

This code will not works because the list returned by Arrays.asList() is an immutable list.

You can construct from an ArrayList constructor to make it works.

List<String> attributes = new ArrayList<String>(Arrays.asList(attribs.split("\\s*,\\s*")));

answered Mar 11, 2013 at 13:43

Rangi Lin

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