ImmutableSet (Guava: Google Core Libraries for Java 19.0 API)

java.lang.Object
- java.util.AbstractCollection<E>
- - com.google.common.collect.ImmutableCollection<E>
  - - com.google.common.collect.ImmutableSet<E>

All Implemented Interfaces:

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

Direct Known Subclasses:

ImmutableSortedSet
```
@GwtCompatible(serializable=true,
               emulated=true)
public abstract class ImmutableSet<E>
extends ImmutableCollection<E>
implements Set<E>
```
A Set whose contents will never change, with many other important properties detailed at ImmutableCollection.

Since:

2.0

See Also:
Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ImmutableSet.Builder<E>
A builder for creating ImmutableSet instances.

Nested Classes
Modifier and Type	Class and Description
`static class`	`ImmutableSet.Builder<E>` A builder for creating `ImmutableSet` instances.

Method Summary

Methods
Modifier and Type	Method and Description
`static <E> ImmutableSet.Builder<E>`	`builder()` Returns a new builder.
`static <E> ImmutableSet<E>`	`copyOf(Collection<? extends E> elements)` Returns an immutable set containing each of `elements`, minus duplicates, in the order each appears first in the source collection.
`static <E> ImmutableSet<E>`	`copyOf(E[] elements)` Returns an immutable set containing each of `elements`, minus duplicates, in the order each appears first in the source array.
`static <E> ImmutableSet<E>`	`copyOf(Iterable<? extends E> elements)` Returns an immutable set containing each of `elements`, minus duplicates, in the order each appears first in the source iterable.
`static <E> ImmutableSet<E>`	`copyOf(Iterator<? extends E> elements)` Returns an immutable set containing each of `elements`, minus duplicates, in the order each appears first in the source iterator.
`boolean`	`equals(Object object)`
`int`	`hashCode()`
`abstract UnmodifiableIterator<E>`	`iterator()` Returns an unmodifiable iterator across the elements in this collection.
`static <E> ImmutableSet<E>`	`of()` Returns the empty immutable set.
`static <E> ImmutableSet<E>`	`of(E element)` Returns an immutable set containing `element`.
`static <E> ImmutableSet<E>`	`of(E e1, E e2)` Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified.
`static <E> ImmutableSet<E>`	`of(E e1, E e2, E e3)` Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified.
`static <E> ImmutableSet<E>`	`of(E e1, E e2, E e3, E e4)` Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified.
`static <E> ImmutableSet<E>`	`of(E e1, E e2, E e3, E e4, E e5)` Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified.
`static <E> ImmutableSet<E>`	`of(E e1, E e2, E e3, E e4, E e5, E e6, E... others)` Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified.

Methods inherited from class com.google.common.collect.ImmutableCollection
add, addAll, asList, clear, contains, remove, removeAll, retainAll, toArray, toArray

Methods inherited from class java.util.AbstractCollection
containsAll, isEmpty, size, toString

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

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

- Method Detail
  - of
```
public static <E> ImmutableSet<E> of()
```
    Returns the empty immutable set. Preferred over Collections.emptySet() for code consistency, and because the return type conveys the immutability guarantee.
  - of
```
public static <E> ImmutableSet<E> of(E element)
```
    Returns an immutable set containing element. Preferred over Collections.singleton(T) for code consistency, null rejection, and because the return type conveys the immutability guarantee.
  - of
```
public static <E> ImmutableSet<E> of(E e1,
                     E e2)
```
    Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified. That is, if multiple elements are equal, all except the first are ignored.
  - of
```
public static <E> ImmutableSet<E> of(E e1,
                     E e2,
                     E e3)
```
    Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified. That is, if multiple elements are equal, all except the first are ignored.
  - of
```
public static <E> ImmutableSet<E> of(E e1,
                     E e2,
                     E e3,
                     E e4)
```
    Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified. That is, if multiple elements are equal, all except the first are ignored.
  - of
```
public static <E> ImmutableSet<E> of(E e1,
                     E e2,
                     E e3,
                     E e4,
                     E e5)
```
    Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified. That is, if multiple elements are equal, all except the first are ignored.
  - of
```
public static <E> ImmutableSet<E> of(E e1,
                     E e2,
                     E e3,
                     E e4,
                     E e5,
                     E e6,
                     E... others)
```
    Returns an immutable set containing the given elements, minus duplicates, in the order each was first specified. That is, if multiple elements are equal, all except the first are ignored.
    
    Since:
    
    3.0 (source-compatible since 2.0)
  - copyOf
```
public static <E> ImmutableSet<E> copyOf(Collection<? extends E> elements)
```
    Returns an immutable set containing each of elements, minus duplicates, in the order each appears first in the source collection.
    Performance note: This method will sometimes recognize that the actual copy operation is unnecessary; for example, copyOf(copyOf(anArrayList)) will copy the data only once. This reduces the expense of habitually making defensive copies at API boundaries. However, the the precise conditions for skipping the copy operation are undefined.
    
    Throws:
    
    NullPointerException - if any of elements is null
    Since:
    
    7.0 (source-compatible since 2.0)
  - copyOf
```
public static <E> ImmutableSet<E> copyOf(Iterable<? extends E> elements)
```
    Returns an immutable set containing each of elements, minus duplicates, in the order each appears first in the source iterable. This method iterates over elements only once.
    Performance note: This method will sometimes recognize that the actual copy operation is unnecessary; for example, copyOf(copyOf(anArrayList)) should copy the data only once. This reduces the expense of habitually making defensive copies at API boundaries. However, the precise conditions for skipping the copy operation are undefined.
    
    Throws:
    
    NullPointerException - if any of elements is null
  - copyOf
```
public static <E> ImmutableSet<E> copyOf(Iterator<? extends E> elements)
```
    Returns an immutable set containing each of elements, minus duplicates, in the order each appears first in the source iterator.
    
    Throws:
    
    NullPointerException - if any of elements is null
  - copyOf
```
public static <E> ImmutableSet<E> copyOf(E[] elements)
```
    Returns an immutable set containing each of elements, minus duplicates, in the order each appears first in the source array.
    
    Throws:
    
    NullPointerException - if any of elements is null
    Since:
    
    3.0
  - equals
```
public boolean equals(@Nullable
             Object object)
```
    Specified by:
    
    equals in interface Collection<E>
    
    Specified by:
    
    equals in interface Set<E>
    
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Collection<E>
    
    Specified by:
    
    hashCode in interface Set<E>
    
    Overrides:
    
    hashCode in class Object
  - iterator
```
public abstract UnmodifiableIterator<E> iterator()
```
    Description copied from class: ImmutableCollection
    
    Returns an unmodifiable iterator across the elements in this collection.
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface Set<E>
    
    Specified by:
    
    iterator in class ImmutableCollection<E>
  - builder
```
public static <E> ImmutableSet.Builder<E> builder()
```
    Returns a new builder. The generated builder is equivalent to the builder created by the ImmutableSet.Builder constructor.

Class ImmutableSet<E>

Nested Class Summary

Method Summary

Methods inherited from class com.google.common.collect.ImmutableCollection

Methods inherited from class java.util.AbstractCollection

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Set

Method Detail

of

of

of

of

of

of

of

copyOf

copyOf

copyOf

copyOf

equals

hashCode

iterator

builder