Field Detail

• EMPTY_LIST

  private static final List<Object> EMPTY_LIST

Constructor Detail

• CollectionUtils

  public CollectionUtils()

Method Detail

• nullSafe

  public static <T> Collection<T> nullSafe(Collection<T> in)

• nullSafeSize

  public static <T> int nullSafeSize(Collection<T> collection)

  size

• nullSafeSameSize

  public static <A,B> boolean nullSafeSameSize(Collection<A> a,
                               Collection<B> b)

• isEmpty

  public static <T> boolean isEmpty(Collection<T> collection)

  empty

• notEmpty

  public static <T> boolean notEmpty(Collection<T> collection)

• getFirst

  public static <T> T getFirst(Collection<T> collection)

  first/last

• getLastIndex

  public static int getLastIndex(List<?> list)

  Parameters:

  list - any list

  Returns:

  -1 if list is empty, otherwise the max index

• isLastIndex

  public static boolean isLastIndex(List<?> list,
                    int index)

  Parameters:

  list -

  index - the index in question

  Returns:

  true if it is the last index or if list is empty and -1 is passed for the index param

• getLast

  public static <T> T getLast(List<T> list)