CoronaController.java

package com.meluleki.corona.CoronaVirusApplicaion;

import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.*;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@RestController
public class CoronaController {

    private RestTemplate rest;
    private HttpHeaders headers;
    private HttpStatus status;

    CoronaController() {
        this.rest = new RestTemplate();
        this.headers = new HttpHeaders();
        headers.add("Content-Type", "application/json");
        headers.add("Accept", "*/*");
    }

    @GetMapping("/fetchCountry")
    public ResponseEntity<Country> fetchCountry(@RequestParam(value = "Country", defaultValue = "China") String name) {
        HttpEntity<String> requestEntity = new HttpEntity<>(headers);
        Country[] countries = rest.getForObject("https://api.covid19api.com/countries", Country[].class);

        if (countries != null) {
            for (Country country : countries) {
                if (name.equals(country.getCountry())) {
                    return new ResponseEntity<>(country, HttpStatus.OK);
                }
            }
        }
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
}
//        HttpClient client = ;
//        HttpRequest request = HttpRequest.newBuilder()
//                .uri(URI.create("https://api.covid19api.com/countries"))
//                .setHeader(HttpHeaders.CONTENT_TYPE, "application/json")
//                .build();
//        String test;
//        HttpHeaders headers = new HttpHeaders();
//        try {
//            test =  client
//                    .send(request, HttpResponse.BodyHandlers.ofString()).body();
//            return test;
//        }catch (InterruptedException | IOException e) {
//            e.printStackTrace();
//            return null;
//   }
// }

//private Country parseToCountry(String jsonBody)
//{

// }

Country.java

package com.meluleki.corona.CoronaVirusApplicaion;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@JsonDeserialize()
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class Country {
    private String Country;
    private String Slug;
    private String ISO2;

    @JsonCreator
    public Country(@JsonProperty("Country") String country,
                   @JsonProperty("Slug") String slug,
                   @JsonProperty("ISO2") String iso2
    ) {
        Country = country;
        Slug = slug;
        ISO2 = iso2;
    }
}