Java 8 vs Java pre-8

Java8vsPre8.java

void prejava8() throws MalformedUrlException {
  Map<String, Cluster> clusters = Maps.newHashMap();
  for (final Map<String, Object> clusterYml : clustersListYml) {
    Cluster cluster = new HystrixCluster(clusterAdapter.fromMap(clusterYml));
    clusters.put(cluster.name(), cluster);
  }
  return clusters;
}

void java8() {
  return clustersListYml.stream()
      .map(map -> {
          try {
              return new HystrixCluster(clusterAdapter.fromMap(map));
          } catch (MalformedURLException e) {
              throw new IllegalArgumentException(e);
          }
      })
      .collect(Collectors.toMap(HystrixCluster::name, Function.identity()));
}