staticInitialiser.java

  // instead of
  private static final java.util.Map<Integer, String> myMap = new java.util.HashMap<>();
  static {
    myMap.put(1, "one");
    myMap.put(2, "two");
  }

  // or
  private static final java.util.Map<Integer, String> myJava9Map = java.util.Map.of(
    1, "one",
    2, "two"
  );

  // do it the functional way
  private static final io.vavr.collection.Map<Integer, String> myVavrMap = io.vavr.collection.HashMap.of(
    1, "one",
    2, "two"
  );