Add extra element to a comma seperated list

Question

I have created an ArrayList from a comma separated string. Now I want to add an extra blank space to this list, but I am getting following error:

java.lang.UnsupportedOperationException
    at java.util.AbstractList.add(AbstractList.java:131)

My Code is

inputParamList=Arrays.asList(inputVariablesNames.split(","));
inputParamList.add("");

`Arrays.asList` returns a fixed-size list, it's written in the documentation. — Alexis C., May 18 '15 at 21:33
Thanks Alexis for you suggestion.But please let me know how can i achieve this. — Ashwani ojha, May 18 '15 at 21:35
You can google "java arrays aslist add" and you'll find the answer within seconds.... — Alexis C., May 18 '15 at 21:36

score 1 · Answer 1 · answered May 18 '15 at 21:34

The List returned by Arrays.asList is only a thin wrapper over an actual array, and you can't add elements to an array.

Returns a fixed-size list backed by the specified array. (Changes to the returned list "write through" to the array.)

Convert it to an ArrayList. Then you can add the extra element to the ArrayList.

inputParamList = new ArrayList<>(Arrays.asList(inputVariablesNames.split(",")));

1 Answers1