rspec/rules/S1640/java/rule.adoc

== Why is this an issue?

When all the keys of a Map are values from the same enum, the ``++Map++`` can be replaced with an ``++EnumMap++``, which can be much more efficient than other sets because the underlying data structure is a simple array.


=== Noncompliant code example

[source,java]
----
public class MyClass {

  public enum COLOR {
    RED, GREEN, BLUE, ORANGE;
  }

  public void mapMood() {
    Map<COLOR, String> moodMap = new HashMap<COLOR, String> ();
  }
}
----


=== Compliant solution

[source,java]
----
public class MyClass {

  public enum COLOR {
    RED, GREEN, BLUE, ORANGE;
  }

  public void mapMood() {
    EnumMap<COLOR, String> moodMap = new EnumMap<> (COLOR.class);
  }
}
----

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== Implementation Specification
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include::message.adoc[]

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