A for loop to iterate over an enum in Java

Question

I have an enum in Java for the cardinal  amp  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

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If you don t care about the order this should work   Set lt Direction gt  directions   EnumSet allOf Direction class   for Direction direction   directions           do stuff

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More methods in java 8   Using EnumSet with forEach  EnumSet allOf Direction class  forEach          Using Arrays asList with forEach   Arrays asList Direction values    forEach

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Try to use a for each  for   Direction direction   Direction values       System out println direction toString

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values   method may simply work  for  Direction  d   Direction values           whatever you want to do with each of these enum values

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we can use a filter JAVA 8  like this  Stream of Direction values    filter name - gt   name toString   startsWith  quot S quot    forEach System out  println

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All the constants of an enum type can be obtained by calling the implicit public static T   values   method of that type    for  Direction d   Direction values           System out println d

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Java8   Stream of Direction values    forEach System out  println     from Java5    for   Direction d  Direction values      System out println d

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for Direction dir   Direction values

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You can do this as follows   for  Direction direction   EnumSet allOf Direction class          do stuff

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for  Direction  d   Direction values               your code here

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Streams  Prior to Java 8  for  Direction dir   Direction values                  System out println dir       Java 8  We can also make use of lambda and streams  Tutorial    Stream of Direction values    forEachOrdered System out  println       Why forEachOrdered and not forEach with streams    The behaviour of forEach is explicitly nondeterministic where as the forEachOrdered performs an action for each element of this stream  in the encounter order of the stream if the stream has a defined encounter order  So forEach does not guarantee that the order would be kept    Also when working with streams  especially parallel ones  keep in mind the nature of streams  As per the doc   Stream pipeline results may be nondeterministic or incorrect if the behavioral parameters to the stream operations are stateful  A stateful lambda is one whose result depends on any state which might change during the execution of the stream pipeline   Set lt Integer gt  seen   Collections synchronizedSet new HashSet lt  gt      stream parallel   map e - gt    if  seen add e   return 0  else return e          Here  if the mapping operation is performed in parallel  the results for the same input could vary from run to run  due to thread scheduling differences  whereas  with a stateless lambda expression the results would always be the same   Side-effects in behavioral parameters to stream operations are  in general  discouraged  as they can often lead to unwitting violations of the statelessness requirement  as well as other thread-safety hazards   Streams may or may not have a defined encounter order  Whether or not a stream has an encounter order depends on the source and the intermediate operations

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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

[java] A 'for' loop to iterate over an enum in Java

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