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gistfile1.txt

On https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html there is the following enum:

public enum Sex {
  MALE, FEMALE
}

Sex and gender are not that simple. Some people don't fit into either category. I realize this is just sample code but it serves to exclude lots of people who will read these docs, so I would suggest changing the field type to something more free-form, such as a String. Or, if it's necessary to use an enum to demonstrate some language feature, use something which is actually a binary state, such as 

public enum AccountType {
   FREE, PREMIUM
} 

Thank you!

Tyler