SetUtils.SetView (Apache Commons Collections 4.2 API)

java.lang.Object
- java.util.AbstractCollection<E>
- - java.util.AbstractSet<E>
  - - org.apache.commons.collections4.SetUtils.SetView<E>

Type Parameters:

E - the element type

All Implemented Interfaces:

Iterable<E>, Collection<E>, Set<E>

Enclosing class:

SetUtils
```
public abstract static class SetUtils.SetView<E>
extends AbstractSet<E>
```
An unmodifiable view of a set that may be backed by other sets.
If the decorated sets change, this view will change as well. The contents of this view can be transferred to another instance via the copyInto(Set) and toSet() methods.

Since:

4.1

Constructor Summary

Constructors
Constructor Description

SetView()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`<S extends Set<E>> void`	`copyInto(S set)`	Copies the contents of this view into the provided set.
`protected abstract Iterator<E>`	`createIterator()`	Return an iterator for this view; the returned iterator is not required to be unmodifiable.
`Iterator<E>`	`iterator()`
`int`	`size()`
`Set<E>`	`toSet()`	Returns a new set containing the contents of this view.

Methods inherited from class java.util.AbstractSet
equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection
add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection
parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable
forEach

Methods inherited from interface java.util.Set
add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, spliterator, toArray, toArray

- Constructor Detail
  - SetView
```
public SetView()
```
- Method Detail
  - iterator
```
public Iterator<E> iterator()
```
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Specified by:
    
    iterator in interface Set<E>
    
    Specified by:
    
    iterator in class AbstractCollection<E>
  - createIterator
```
protected abstract Iterator<E> createIterator()
```
    Return an iterator for this view; the returned iterator is not required to be unmodifiable.
    
    Returns:
    
    a new iterator for this view
  - size
```
public int size()
```
    Specified by:
    
    size in interface Collection<E>
    
    Specified by:
    
    size in interface Set<E>
    
    Specified by:
    
    size in class AbstractCollection<E>
  - copyInto
```
public <S extends Set<E>> void copyInto(S set)
```
    Copies the contents of this view into the provided set.
    
    Type Parameters:
    
    S - the set type
    
    Parameters:
    
    set - the set for copying the contents
  - toSet
```
public Set<E> toSet()
```
    Returns a new set containing the contents of this view.
    
    Returns:
    
    a new set containing all elements of this view