replace null to empty string in Java

Question

I have below string output :

["Kolkata","data can be, null",null,"05/31/2020",null]

but I want to have the output like below format in Java

["Kolkata","data can be, null","","05/31/2020",""]

please help me .

I am converting object to json data . Please see the below codes

List<String> test = new ArrayList<>();
List<Object[]> data =query.list();          
for (int i = 0; i < data.size(); i++) {
    Object[] row = (Object[]) data.get(i);

    String  jsonString = gson.toJson(row);
    test.add(jsonString);
}

I want to apply this on jsonString variable using java 7 as not using java 8

Does this data exist purely as a string or is it derived from a collection / array? If it's just a string, can you use a JSON library or something to parse it into a collection? — Jaybird, Apr 07 '20 at 17:57

score 1 · Answer 1 · answered Apr 07 '20 at 18:12

1

If you have list for example list of like this

List<String> list = Arrays.asList("Kolkata","data can be, null",null,"05/31/2020",null);
    list.replaceAll(t -> Objects.isNull(t) ? "''" : t);
    System.out.println(list);

Here oputput will be:

[Kolkata, data can be, null, '', 05/31/2020, '']

answered Apr 07 '20 at 18:12

Reeta Wani

197
4
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Please do not assume that it is a list. Always clarify before posting answers. Although it works, please don't encourage such sloppy questions by answering them. – Harshal Parekh Apr 07 '20 at 18:43
i am converting object to json data . Please see the below codes List test = new ArrayList<>(); List – Pintu Apr 07 '20 at 19:12

replace null to empty string in Java

1 Answers1