How to remove an element of a HashMap whilst streaming (lambda)

Question

I have the following situation where I need to remove an element from a stream.

map.entrySet().stream().filter(t -> t.getValue().equals(\"0\")).
                 


        

Answer 1

1st time replying. Ran across this thread and thought to update if others are searching. Using streams you can return a filtered map<> or whatever you like really.

  @Test
  public void test() {

    Map map1 = new HashMap<>();
    map1.put("dan", "good");
    map1.put("Jess", "Good");
    map1.put("Jaxon", "Bad");
    map1.put("Maggie", "Great");
    map1.put("Allie", "Bad");

    System.out.println("\nFilter on key ...");
    Map map2 = map1.entrySet().stream().filter(x -> 
    x.getKey().startsWith("J"))
        .collect(Collectors.toMap(e -> e.getKey(), e -> e.getValue()));

    map2.entrySet()
      .forEach(s -> System.out.println(s));

    System.out.println("\nFilter on value ...");
    map1.entrySet().stream()
      .filter(x -> !x.getValue().equalsIgnoreCase("bad"))
      .collect(Collectors.toMap(e -> e.getKey(),  e -> e.getValue()))
      .entrySet().stream()
      .forEach(s -> System.out.println(s));
  }

------- output -------

Filter on key ...
Jaxon=Bad
Jess=Good

Filter on value ...
dan=good
Jess=Good
Maggie=Great