Convert empty array string to array

Question

I have an empty array string

String stringArray = "[]";

And I want to convert it to an Array type.

I need this because I want to compare in an if statement if the array is empty. Like

if(stringArray.isEmpty()){
   // doSomething 
}

Any suggestion how I can do this?

How about simply stringArray.equals("[]")? How did you get such a thing in the first place? This sounds very much like an XY problem... — Sweeper
– Sweeper, Commented Jun 25, 2021 at 10:13
You could (not meaning you should) use a JSON parser to parse this array — Lino
– Lino, Commented Jun 25, 2021 at 10:14
@Sweeper I get it from another system. I extracted it then to a string. — dernor00
– dernor00, Commented Jun 25, 2021 at 11:43

Lynn.Gao · Accepted Answer · 2021-06-25 10:35:25Z

2

    public static void main(String[] args) {
        String stringArray = "[]";
        Object[] array = JSON.parseArray(stringArray).toArray();
        if (array.length == 0) {
            System.out.println("array is empty");
        }
    }

output is:

array is empty

answered Jun 25, 2021 at 10:35

Lynn.Gao

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2 Comments

Lynn.Gao Over a year ago

you can use more other tools parse it as a json string to array

dernor00 Over a year ago

I wanted to try this one, which package or dependency is JSON (JSON.parseArray)?

stic-lab · Accepted Answer · 2021-06-25 10:21:39Z

0

String stringArray = "[]";

In this line, you didn't define an empty array. You have definee new string where the value is []

Use the code below if you would like to define an empty array

String[] stringArray ; //Define string array without initialization
String[] stringArray2 = new String[5];//Define string array with 5 element

edited Jun 25, 2021 at 10:21

answered Jun 25, 2021 at 10:16

stic-lab

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1 Comment

dernor00 Over a year ago

Yes I know I defined a string with this "[]" value. This is what I get from another system, that's why I asked how to parse it to an array

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