@GwtCompatible public abstract class ForwardingSet<E> extends ForwardingCollection<E> implements Set<E>
Warning: The methods of
indiscriminately to the methods of the delegate. For example,
ForwardingCollection.add(E) alone will not change the behavior of
ForwardingCollection.addAll(java.util.Collection<? extends E>), which can lead to unexpected behavior. In this case, you should
addAll as well, either providing your own implementation, or
delegating to the provided
standard methods are not guaranteed to be thread-safe, even
when all of the methods that they depend on are thread-safe.
|Modifier||Constructor and Description|
Constructor for use by subclasses.
|Modifier and Type||Method and Description|
Returns the backing delegate instance that methods are forwarded to.
Indicates whether some other object is "equal to" this one.
Returns a hash code value for the object.
A sensible definition of
A sensible definition of
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, standardAddAll, standardClear, standardContains, standardContainsAll, standardIsEmpty, standardRemove, standardRetainAll, standardToArray, standardToArray, standardToString, toArray, toArray
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
delegate(). Concrete subclasses override this method to supply the instance being decorated.
equals method implements an equivalence relation
on non-null object references:
trueif and only if
y, multiple invocations of
trueor consistently return
false, provided no information used in
equalscomparisons on the objects is modified.
equals method for class
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values
y, this method returns
true if and only
y refer to the same object
x == y has the value
Note that it is generally necessary to override the
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.
public int hashCode()
The general contract of
hashCodemethod must consistently return the same integer, provided no information used in
equalscomparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
equals(Object)method, then calling the
hashCodemethod on each of the two objects must produce the same integer result.
Object.equals(java.lang.Object)method, then calling the
hashCodemethod on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by
Object does return distinct integers for distinct
objects. (This is typically implemented by converting the internal
address of the object into an integer, but this implementation
technique is not required by the
JavaTM programming language.)
protected boolean standardRemoveAll(Collection<?> collection)
ForwardingCollection.removeAll(java.util.Collection<?>)in terms of
ForwardingCollection.remove(java.lang.Object). If you override
remove, you may wish to override
ForwardingCollection.removeAll(java.util.Collection<?>)to forward to this implementation.
protected boolean standardEquals(@Nullable Object object)
equals(java.lang.Object)in terms of
ForwardingCollection.containsAll(java.util.Collection<?>). If you override either of those methods, you may wish to override
equals(java.lang.Object)to forward to this implementation.
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