I have a object list-
List<Object> sample = new ArrayList<Object>();
and it contain following values-
[This is an apple., Ram is a boy., What is your name?].
I want to modify it like this-
[{ "q": "This is an apple." }, { "q": "Ram is a boy" }, { "q": "What is your name?" }]
How to do it?
P.S - I am new to Java. Thanks for your help in advance.
You can do this by creating List of JSONObject as below:
List<JSONObject> yourList = new ArrayList<JSONObject>();
for(Object obj: sample) {
JSONObject jsonObj = new JSONObject();
jsonObj.put("q",(String)obj);
yourList.add(jsonObj);
}
Above code will create a new list with name yourList with required format of data.
You can use a custom model as :
class CustomObject {
String q;
...getters, setters etc
}
and use further it as
List<CustomObject> = new ArrayList<CustomObject>();
Here is if you are on jdk8 or later:
import java.util.*;
import java.util.stream.*;
public class HelloWorld{
public static void main(String []args){
List<String> sample = new ArrayList<String>(Arrays.asList("This is an apple.", "Ram is a boy.", "What is your name?"));
System.out.println(sample);
List<Map<String,String>> transformed = sample.stream()
.map(p -> {Map<String,String> m = new HashMap<String,String>(); m.put("q",p); return m;})
.collect(Collectors.toList());
System.out.println(transformed);
}
}
Edit: Instead of List<Map<String,String>> transformed , you can also use Map.Entry<String,String> as well as it's just key-value pair you want in your list.
qfield (that you should name much better), put instances of that class in a list. Make sure to use the right generic type for your list: List<MayNewClass>.