A 'for' loop to iterate over an enum in Java

2018-05-29 21:20:01

I have an enum in Java for the cardinal & intermediate directions:

public enum Direction {
   NORTH,
   NORTHEAST,
   EAST,
   SOUTHEAST,
   SOUTH,
   SOUTHWEST,
   WEST,
   NORTHWEST
}

How can I write a for loop that iterates through each of these enum values?

`.values()`

You can call the values() method on your enum.

for (Direction dir : Direction.values()) {
  // do what you want
}

This values() method is implicitly declared by the compiler. So it is not listed on Enum doc.

枚举值＃（）：

 for (Direction d : Direction.values()) {
     System.out.println(d);
 }

你可以这样做，如下所示：

for (Direction direction : EnumSet.allOf(Direction.class)) {
  // do stuff
}

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