Java.util.EnumSet.of() 方法

package com.codingdict;

import java.util.*;

public class EnumSetDemo {

   // create an enum
   public enum Numbers {
      ONE, TWO, THREE, FOUR, FIVE
   };

   public static void main(String[] args) {

      // create a set
      EnumSet<Numbers> set;

      // add one element
      set = EnumSet.of(Numbers.FIVE);

      // print the set
      System.out.println("Set:" + set);

      // add another element which replaces the previous
      set = EnumSet.of(Numbers.THREE);

      // print the set. Notice that it has one element
      System.out.println("Set:" + set);
   }
}