public final class Collections extends Object
Collection
s.Modifier and Type | Method and Description |
---|---|
static <T> Collection<T> |
duplicatesFrom(Collection<T> c)
Returns any duplicate elements from the given
Collection . |
static String |
format(Collection<?> c)
Returns the
String standard representation of
the given Collection , or null if the given Collection is null . |
static String |
format(Collection<?> c,
String start,
String end)
Returns the
String standard representation of
the given Collection , or null if the given Collection is null . |
static String |
format(Representation p,
Collection<?> c)
Returns the
String representation of the given Collection , or null if the given
Collection is null . |
static String |
format(Representation p,
Collection<?> c,
String start,
String end)
Returns the
String representation of the given Collection , or null if the given
Collection is null . |
static boolean |
isNullOrEmpty(Collection<?> c)
Indicates whether the given
Collection is null or empty. |
static <T> List<T> |
nonNullElementsIn(Collection<T> c)
Returns all the non-
null elements in the given Collection . |
public static <T> Collection<T> duplicatesFrom(Collection<T> c)
Collection
.T
- the generic type of the given Collection
.c
- the given Collection
that might have duplicate elements.Collection
containing the duplicate elements of the given one. If no duplicates are found, an
empty Collection
is returned.public static boolean isNullOrEmpty(Collection<?> c)
Collection
is null
or empty.c
- the given Collection
.true
if the given Collection
is null
or empty, otherwise false
.public static String format(Collection<?> c)
String
standard representation
of
the given Collection
, or null
if the given Collection
is null
.c
- the Collection
to format.String
representation of the given Collection
.public static String format(Representation p, Collection<?> c)
String
representation of the given Collection
, or null
if the given
Collection
is null
.p
- c
- the Collection
to format.String
representation of the given Collection
.public static String format(Collection<?> c, String start, String end)
String
standard representation
of
the given Collection
, or null
if the given Collection
is null
.c
- the Collection
to format.String
representation of the given Collection
.public static String format(Representation p, Collection<?> c, String start, String end)
String
representation of the given Collection
, or null
if the given
Collection
is null
.p
- c
- the Collection
to format.String
representation of the given Collection
.public static <T> List<T> nonNullElementsIn(Collection<T> c)
null
elements in the given Collection
.T
- the type of elements of the Collection
.c
- the given Collection
.null
elements in the given Collection
. An empty list is returned if the given
Collection
is null
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