Convert array-like String to ArrayList in Java [duplicate]

Question

I've been trying to convert a String like this: "[1,2,3]" to an ArrayList in Java. What I tried so far is to use GSon library to convert the String mentioned above to List using:

but it ends with an exception (I can provide more details if needed). The first question should be actually if it's a good approach to achieve such a transformation?

The first question should be actually if it's a good approach to achieve such a transformation? Yes, it's fine. but it ends with an exception (I can provide more details if needed). Please do. — shmosel
– shmosel, Commented Nov 14, 2017 at 19:25
You could cut the brackets away [ ] and split the string by the coma. Something like: String employee = "Smith,Katie,3014,,8.25,6.5,,,10.75,8.5"; String delims = "[,]"; String[] tokens = employee.split(delims); The tokens array then could be easily converted to an arraylist. — melanzane
– melanzane, Commented Nov 14, 2017 at 19:31

SirCipher · Accepted Answer · 2017-11-14 20:15:18Z

4

A non-regex method would be to remove the brackets from the string and then split on the commas. Then convert to an ArrayList.

String s = "[1, 2, 3]";
String[] splits =  s.replace("[","").replace("]","").split(",");
ArrayList<String> arrayList = new ArrayList<>(Arrays.asList(splits));

answered Nov 14, 2017 at 20:15

SirCipher

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H. Sodi · Accepted Answer · 2017-11-14 20:08:14Z

0

I suggest you use regular expression to convert the string from "[1,2,3,...]" to "1,2,3,..." and then ue asList() method of Arrays class to convert it to a List.

Refer the following snippet

import java.util.regex.*;
...
...
String str = "[1,2,3,4,5,6,7,8,9,10]";
str = str.replaceAll("[(*)])","$1");
List<String> items = Arrays.asList(str.split("\\s*,\\s*"));

answered Nov 14, 2017 at 20:08

H. Sodi

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