web/play-java-forms/src/main/java/play/data/DynamicForm.java
public Optional<Object> value(String key) {
    return super.value().map(v -> v.getData().get(asNormalKey(key)));
  }
public Optional<Object> value(String key) {
    return super.value().map(v -> v.getData().get(asNormalKey(key)));
  }
Gets the concrete value

@param key the string key.
@return the value