Récupérer la réponse d'une API en JSON

String str = "{ \"name\": \"Alice\", \"age\": 20 }";
JSONObject obj = new JSONObject(str);
String n = obj.getString("name");
int a = obj.getInt("age");
System.out.println(n + " " + a);  // prints "Alice 20"

import java.util.List;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.Response;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;

@JsonIgnoreProperties(ignoreUnknown=true)
class User {
    @JsonProperty("name")
    public String name;
    
    @JsonProperty("address")
    public Address address;
}

@JsonIgnoreProperties(ignoreUnknown = true)
class Address {
    @JsonProperty("city")
    public String city;
}

public class Application {
    public static void main(String[] args) {
        Response response = ClientBuilder.newClient().register(JacksonJsonProvider.class)
                .target("https://jsonplaceholder.typicode.com/").path("users")
                .request().get();

        List<User> users = response.readEntity(new GenericType<List<User>>() {});
        for (User user : users) {
            System.out.println(user.name + " : " + user.address.city);
        }
    }
}

<dependencies>
    <dependency>
        <groupId>org.apache.cxf</groupId>
        <artifactId>cxf-rt-rs-client</artifactId>
        <version>3.0.15</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.jaxrs</groupId>
        <artifactId>jackson-jaxrs-json-provider</artifactId>
        <version>2.10.0</version>
    </dependency>
</dependencies>