title: I need check if enum element is into enum set
body: <p>I'm new in java. I need check if enum element is into enum set. </p>
  
  <p>in Delphi: </p>
  
  <pre><code>type
    TWeekEnum = (weMonday, weTuesday, weWednesday, weThursday, weFriday, weSaturday, weSunday)
    TWeekSetEnum = (weSaturday, weSunday)
  
  
    if (weSunday in (TWeekSetEnum))
    ...
  </code></pre>
  
  <p>Java?</p>