Java Convert string array to list

Question

I have the following string and would like to convert it to string array

String singleArray = "[501]"
String multipleArray = "[1,501,634]"

I would like to get List<String> from that, the thing is sometimes it can be a single value and sometimes it can be multiple value seperate by comma.

I tried to use Arrays.asList(multipleArray) but it didn't work.

Any suggestions?

Answer 1

1. Get the substring between the first and the last character in order to get rid of the [ and ] characters.
2. Split the resulting string by , .

For example:

String input = "[1,501,634]";
String[] result = input.substring(1, input.length() - 1).split(",");
List<String> asList = Arrays.asList(result);

Answer 2

How about

String arr [] = str.replace("[", "").replace ("]", "").split (",");

And then as per your knowledge, you can use the array to create a List using

Arrays.asList(arr);

Note

As noted by Bas.E, my solution works upon the data as per your example.

Answer 3

1. Remove [ and ] from the beginning and ending using substring .

2. split rest of the string according to the occurrence of , .

    String[] arr = multipleArray.substring( 1, multipleArray.length()-1).split(","); 

3. then use the array to make a list.

    List<String> list=Arrays.asList(arr); 

Answer 4

From asList(T...) It should be like:

List<String> stooges = Arrays.asList("Larry", "Moe", "Curly");

Now in your question you have to create array then pass it to Arrays.asList

String [] arr =  multipleArray.replaceAll( "^\[|\]$", "").split( "," );
List<String> yourList = Arrays.asList(arr);

Answer 5

Remove the leading and trailing square brackets:

String removedBrackets = multipleArray.replaceAll( "^\\[|\\]$", "" );

or

String removedBrackets = multipleArray.substring( 1, multipleArray.length() - 1 );

Then split the string on the commas:

String[] arrayOfValues = removedBrackets.split( "," );

Then convert it to a list:

List<String> listOfValues = Arrays.asList( arrayOfValues );

Answer 6

trim it from side brackets

array = array.substring(1,array.length()-1);

then split and convert to array

String[] arrayStringArray = array.split(",");

and if wanted, make it a List

List<String> arrayStringList = Arrays.asList(arrayStringArray);