it.unimi.dsi.fastutil.objects

Class AbstractObjectSet<K>

java.lang.Object

java.util.AbstractCollection<K>

it.unimi.dsi.fastutil.objects.AbstractObjectCollection<K>

it.unimi.dsi.fastutil.objects.AbstractObjectSet<K>

All Implemented Interfaces:

ObjectCollection<K>, ObjectIterable<K>, ObjectSet<K>, Cloneable, Iterable<K>, Collection<K>, Set<K>

Direct Known Subclasses:

AbstractObjectSortedSet, ObjectArraySet, ObjectOpenCustomHashSet, ObjectOpenHashBigSet, ObjectOpenHashSet, ObjectSets.Singleton

public abstract class AbstractObjectSet<K>
extends AbstractObjectCollection<K>
implements Cloneable, ObjectSet<K>

An abstract class providing basic methods for sets implementing a type-specific interface.

Note that the type-specific Set interface adds a type-specific remove() method, as it is no longer harmful for subclasses. Thus, concrete subclasses of this class must implement remove() (the rem() implementation of this class just delegates to remove()).

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Indicates whether some other object is "equal to" this one.
int	hashCode() Returns a hash code for this set.
abstract ObjectIterator<K>	iterator() Returns an iterator over the elements contained in this collection.

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObjectCollection

toString

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, isEmpty, remove, removeAll, retainAll, size, toArray, toArray

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, isEmpty, remove, removeAll, retainAll, size, spliterator, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

iterator

public abstract ObjectIterator<K> iterator()

Description copied from class: java.util.AbstractCollection

Returns an iterator over the elements contained in this collection.

Specified by:

iterator in interface ObjectCollection<K>

Specified by:

iterator in interface ObjectIterable<K>

Specified by:

iterator in interface ObjectSet<K>

Specified by:

iterator in interface Iterable<K>

Specified by:

iterator in interface Collection<K>

Specified by:

iterator in interface Set<K>

Specified by:

iterator in class AbstractObjectCollection<K>

Returns:

an iterator over the elements contained in this collection

See Also:

Iterable.iterator()

equals

public boolean equals(Object o)

Description copied from class: java.lang.Object

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Specified by:

equals in interface Collection<K>

Specified by:

equals in interface Set<K>

Overrides:

equals in class Object

Parameters:

o - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns a hash code for this set. The hash code of a set is computed by summing the hash codes of its elements.

Specified by:

hashCode in interface Collection<K>

Specified by:

hashCode in interface Set<K>

Overrides:

hashCode in class Object

Returns:

a hash code for this set.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)