Question

I have an enumeration that I am trying to initialize from a long value that comes from the database.

public enum ArticlePermission {
   NONE(0),
   CAN_READ(2),
   CAN_EDIT(4),
   CAN_DELETE(8),
   CAN_CREATE(16);

   private long _value;

   public ArticlePermission(int val) {
     this._value = val;
   }


   public long getValue() {
     return this._value;
   }


   public EnumSet<ArticlePermission> init(long val) {
     EnumSet<ArticlePermission> es = EnumSet.of(ArticlePermission.NONE);

     for(ArticlePermission p : values()) {
        if(val & p.getValue() != 0) {
          es.add(p);
        }
     }



      return es;
   }

}

I’m getting a compile error saying the & operator cannot be used on a long value.

How can I do this correctly then?

Answer 1

Or if you really did want to do a bitwise comparison, you just need extra parentheses:

if((val & getValue()) != 0) {
   // do something
   }