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//Sample productDetailsJson = "{'productId' : '1', 'name': 'Xbox360', 'price': '18000', 'currency': 'INR'}";
public Map<String, Object> buildProductMap(String productDetailsJson) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    Map<String, Object> productMap = mapper.readValue(productDetailsJson, new TypeReference<Map<String, String>>(){});
    return productMap;
}

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//Sample productDetailsJson = "{'productId' : '1', 'name': 'Xbox360', 'price': '18000', 'currency': 'INR'}";
public Product buildConcreteProduct(String productDetailsJson) {
  ObjectMapper mapper = new ObjectMapper();
  Product product = mapper.readValue(productDetailsJson, Product.class);
  return product;
}

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public Future<String> buildOrderDetail(String orderId) {
  CompletableFuture<String> products = supplyAsync(() -> getProductList(orderId)); 
  CompletableFuture<String> addressDetails = supplyAsync(() -> getAddress(orderId));
  CompletableFuture<Void> combinedFuture  = CompletableFuture.allOf(products, addressDetails);
  return combinedFuture.get();
}

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package com.microservices.example;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.async.DeferredResult;

import java.util.concurrent.TimeUnit;

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    public static final String URL = "http://bookmarkservice.herokuapp.com/bookmarks";

try {
            String recordListAsString = ClientBuilder.newClient().target(URL).request().accept(MediaType.APPLICATION_JSON).get(String.class);
            Gson gson = new Gson();
            Type type = new TypeToken<List<Bookmark>>() { }.getType();
            List<Bookmark> list = gson.fromJson(recordListAsString, type);
            return list;
        } catch (Exception ce) {
            return null;

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public interface IAnalyzer {
 
    public void collectSample();
 
    public String analyzeSample();
 
}

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public interface IRover {

    public void run();

    public String currentLocation();

    public void turnRight();

    public void turnLeft();

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public class MarsRoverTest {

    @Test
    public void canProvideCurrentLocationAsString() {
        //Given
        // a set of coordinates and plateau

        //When
        // we initialize the 
        // rover with coordinates and plateau

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public class BeverageMaker {
    public Beverage prepareBeverage(IBeverageStrategy beverageStrategy) {
        //Delegates to strategy
        return beverageStrategy.prepare();
    }
}

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public class BeverageMaker {

    public Beverage prepareBeverage(String beverageName) {
        Beverage preparedBeverage = null;
        if("Coffee".equals(beverageName)) {
            //Uses builder pattern
            preparedBeverage = new Beverage("Coffee").addCoffeePowderTbsp(2).addMilkCups(2).addSugarTbsp(1).prepare();
        } else if ("Tea".equals(beverageName)) {
            preparedBeverage = new Beverage("Tea").addTeaPowderTbsp(2).addMilkCups(2).addSugarTbsp(1).prepare();
        } else if ("Black Tea".equals(beverageName)) {