interceptor in angular 8 stack overflow example

Example 1: how to create app.routing.module.ts in angular 6

ng generate module app-routing --flat --module=app

Example 2: java 8 hashmap example stackoverflow

Optional<List> o = id1.entrySet()
                      .stream()
                      .filter( e -> e.getKey() == 1)
                      .map(Map.Entry::getValue)
                      .findFirst();