How to return a set of objects with Spring Boot?

Question

I did a lesson about Spring Boot and it works perfectly. But what if I want to return a set of objects ? I tried doing this but it doesn\'t work. How can I do i

Answer 1

Let Say we have list of CarDetails Pojo and we want to return them back

@RestController
public class CarDetailController {
  @GetMapping("/viewAllCarDetailList")
    public List retrieveAllCarDetails() {
        List contacts = new ArrayList();

        CarDetail objt = new CarDetail();
        objt.setCarModel("hyundai");
        objt.setSubModel("I10");
        CarDetail objt2 = new CarDetail();
        objt2.setCarModel("hyundai");
        objt2.setSubModel("I20");        
        contacts.add(objt);
        contacts.add(objt2);
        return contacts;
    }
}
    public class CarDetails {

            private String carModel;
            private String subModel;
// Will haave Setter getter and hash code equls method
//and constructor
    }

This JSON will be output:-

[
    {
        "carModel": "hyundai",
        "subModel": "I10"
    },
    {
        "carModel": "hyundai",
        "subModel": "I20"
    }
]