How to fill all the fields in the class?

Question

Suppose I have a class that has a lot of different fields. This class is a DTO and for testing purposes, I do not care about actual values, just it exists. Is there any tool

Answer 1

You can get the type of the field by reflection, and then initialize it to whatever you want, also using reflection.

public static void main(String[] args) {
        MyDTO myDTO = new MyDTO();
        Field [] fields = myDTO.getClass().getDeclaredFields();
        for (Field field: fields){
            if (field.getType().equals(Integer.TYPE)){
                //Primitives are already initialized to 0, so no need to do anything.
            }else if (field.getType().equals(String.class)){
                System.out.println("String");
                //Invoke setter method with reflection, initialize to ""
            }
        }
    }