public abstract class CollectionUtils extends Object
| Constructor and Description | 
|---|
| CollectionUtils() | 
| Modifier and Type | Method and Description | 
|---|---|
| static <T> Collection<T> | cloneCollection(Collection<T> collection) | 
| static <T> List<T> | cloneList(List<T> list) | 
| static <K,V> Map<K,V> | cloneMap(Map<K,V> map) | 
| static <T> boolean | equals(Collection<T> c1,
      Collection<T> c2) | 
| static <T> T | first(Collection<T> collection) | 
| static boolean | isEmpty(Collection<?> collection)Return  trueif the suppliedCollectionis null or empty. | 
| static <T> List<T> | toList(T... items)Converts the supplied array into a List. | 
| static <T> Set<T> | toSet(T... items)Converts the supplied array into a Set. | 
| static <T> java.util.stream.Stream<T> | toStream(Collection<T> collection) | 
| static <T> List<T> | toUnmodifiableList(T... items) | 
| static <T> Set<T> | toUnmodifiableSet(T... items) | 
public static boolean isEmpty(Collection<?> collection)
true if the supplied Collection is null or empty. Otherwise,
 return false.collection - the Collection to checkpublic static <T> java.util.stream.Stream<T> toStream(Collection<T> collection)
public static <T> List<T> toList(T... items)
source - the original arraypublic static <T> List<T> toUnmodifiableList(T... items)
public static <T> Set<T> toSet(T... items)
source - the original arraypublic static <T> Set<T> toUnmodifiableSet(T... items)
public static <T> boolean equals(Collection<T> c1, Collection<T> c2)
public static <T> Collection<T> cloneCollection(Collection<T> collection)
public static <T> T first(Collection<T> collection)
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