de.unkrig.commons.util.collections

Class Sets

java.lang.Object

de.unkrig.commons.util.collections.Sets

public final class Sets
extends Object

Utility methods related to Sets.

Field Summary

Fields

Modifier and Type	Field and Description
static SortedSet	EMPTY_SORTED_SET Desperately missing from java.util.Collections.

Method Summary

Modifier and Type	Method and Description
static <E> List<Set<E>>	allSubsets(Set<E> set)
static <T> SortedSet<T>	emptySortedSet() Desperately missing from java.util.Collections.
static <T> Set<T>	intersection(Collection<? extends T> lhs, Collection<? extends T> rhs) Creates and returns a set that contains all elements that are contained both in lhs and rhs.
static <T> Set<T>	of(T... values) Creates and returns a Set that contains the given values.
static <T> Set<T>	union(Collection<? extends T> lhs, Collection<? extends T> rhs) Creates and returns a set that contains all elements of lhs and rhs.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EMPTY_SORTED_SET

public static final SortedSet EMPTY_SORTED_SET

Desperately missing from java.util.Collections.

Method Detail

allSubsets

public static <E> List<Set<E>> allSubsets(Set<E> set)

Returns:

A list of (immutable) sets, starting with the empty set, followed by a set containing the last element of the set, followed by all other subsets, and ending with (an immutable copy of) the set itself

emptySortedSet

public static <T> SortedSet<T> emptySortedSet()

Desperately missing from java.util.Collections.

of

public static <T> Set<T> of(T... values)

Creates and returns a Set that contains the given values.

The implementation of the set, and whether the set is modifiable or not, is unspecified.

union

public static <T> Set<T> union(Collection<? extends T> lhs,
                               Collection<? extends T> rhs)

Creates and returns a set that contains all elements of lhs and rhs.

The implementation of the result set, and whether it is modifiable or not, is unspecified.

intersection

public static <T> Set<T> intersection(Collection<? extends T> lhs,
                                      Collection<? extends T> rhs)

Creates and returns a set that contains all elements that are contained both in lhs and rhs.

The implementation of the result set, and whether it is modifiable or not, is unspecified.