Converting List to Two dimensional array Java for TestNG data provider

If you are using TestNG you would find that to use a method as a data provider you have to create a method that returns a two dimensional Object array.

So if I have a List of (say) Students , is there any utility method to convert it into a two dimensional array.

I am NOT looking to convert it manually using a loop like this

List<Student> studentList = getStudentList();

Object objArray = new Object[studentList.size];

for(int i=0;i< studentList.size();i++)
objArray[i] = new Object[1];
objArray[i][0] = studentList.get(i);


return objArray;


Instead I am looking at a utility function if any is available in any of the libraries.

Or a better way of writing a data provider method for TestNG

3 Answers
3

This is not directly answer your question. But you can also solve that problem like this

@DataProvider
public Iterator<Object> studentProvider()
List<Student> students = getStudentList();
Collection<Object> data = new ArrayList<Object>();
students.forEach(item -> data.add(new Objectitem));
return data.iterator();



With Java 8 streams (and using this question about converting a stream into array):

@DataProvider
public Object studentProvider()
return studentList.stream()
.map(student -> new Object student )
.toArray(Object::new);



So be it ... let stackoverflow call me a tumbleweed ... but here is the answer.

List<Student> studentList = getStudentList();

Object objArray = new Object[studentList.size];

for(int i=0;i< studentList.size();i++)
objArray[i] = new Object[1];
objArray[i][0] = studentList.get(i);


return objArray


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