public class CollectionUtils
extends java.lang.Object
| Modifier and Type | Class and Description | 
|---|---|
| static class  | CollectionUtils.EmptyEnumeration<E>An empty enumeration. | 
| Modifier and Type | Field and Description | 
|---|---|
| static java.util.List | EMPTY_LISTDeprecated.  | 
| Constructor and Description | 
|---|
| CollectionUtils() | 
| Modifier and Type | Method and Description | 
|---|---|
| static <E> java.util.Enumeration<E> | append(java.util.Enumeration<E> e1,
      java.util.Enumeration<E> e2)Append one enumeration to another. | 
| static <T> java.util.Collection<T> | asCollection(java.util.Iterator<? extends T> iter)Returns a collection containing all elements of the iterator. | 
| static <E> java.util.Enumeration<E> | asEnumeration(java.util.Iterator<E> iter)Adapt the specified Iterator to the Enumeration interface. | 
| static <E> java.util.Iterator<E> | asIterator(java.util.Enumeration<E> e)Adapt the specified Enumeration to the Iterator interface. | 
| static boolean | equals(java.util.Dictionary<?,?> d1,
      java.util.Dictionary<?,?> d2)Deprecated. 
 since 1.6.x. | 
| static boolean | equals(java.util.Vector<?> v1,
      java.util.Vector<?> v2)Deprecated. 
 since 1.6.x. | 
| static java.lang.String | flattenToString(java.util.Collection<?> c)Creates a comma separated list of all values held in the given
 collection. | 
| static int | frequency(java.util.Collection<?> c,
         java.lang.Object o)Counts how often the given Object occurs in the given
 collection using equals() for comparison. | 
| static <K,V> void | putAll(java.util.Dictionary<? super K,? super V> m1,
      java.util.Dictionary<? extends K,? extends V> m2)Deprecated. 
 since 1.6.x. | 
@Deprecated public static final java.util.List EMPTY_LIST
public static boolean equals(java.util.Vector<?> v1,
             java.util.Vector<?> v2)
v1 - the first vector.v2 - the second vector.public static boolean equals(java.util.Dictionary<?,?> d1,
             java.util.Dictionary<?,?> d2)
Follows the equals contract of Java 2's Map.
d1 - the first directory.d2 - the second directory.public static java.lang.String flattenToString(java.util.Collection<?> c)
c - collection to transformpublic static <K,V> void putAll(java.util.Dictionary<? super K,? super V> m1,
                java.util.Dictionary<? extends K,? extends V> m2)
K - type of the keyV - type of the valuem1 - the to directory.m2 - the from directory.public static <E> java.util.Enumeration<E> append(java.util.Enumeration<E> e1,
                                  java.util.Enumeration<E> e2)
E - element typee1 - the first enumeration.e2 - the subsequent enumeration.public static <E> java.util.Enumeration<E> asEnumeration(java.util.Iterator<E> iter)
E - element typeiter - the Iterator to adapt.public static <E> java.util.Iterator<E> asIterator(java.util.Enumeration<E> e)
E - element typee - the Enumeration to adapt.public static <T> java.util.Collection<T> asCollection(java.util.Iterator<? extends T> iter)
T - element typeiter - the Iterator to convertpublic static int frequency(java.util.Collection<?> c,
            java.lang.Object o)
c - collection in which to searcho - object to search