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Collection Factory Methods

List<E> Factory Method Examples

List<Integer> immutableEmptyList = List.of();
- Initializes an empty, immutable List<Integer>.
List<Integer> immutableList = List.of(1, 2, 3, 4, 5);
- Initializes an immutable List<Integer> with five initial elements.
List<Integer> mutableList = new ArrayList<>(immutableList);
- Initializes a mutable List<Integer> from an immutable List<Integer>.

Set<E> Factory Method Examples

Set<Integer> immutableEmptySet = Set.of();
- Initializes an empty, immutable Set<Integer>.
Set<Integer> immutableSet = Set.of(1, 2, 3, 4, 5);
- Initializes an immutable Set<Integer> with five initial elements.
Set<Integer> mutableSet = new HashSet<>(immutableSet);
- Initializes a mutable Set<Integer> from an immutable Set<Integer>.

Map<K, V> Factory Method Examples

Map<Integer, Integer> immutableEmptyMap = Map.of();
- Initializes an empty, immutable Map<Integer, Integer>.
Map<Integer, Integer> immutableMap = Map.of(1, 2, 3, 4);
- Initializes an immutable Map<Integer, Integer> with two initial key-value entries.
Map<Integer, Integer> immutableMap = Map.ofEntries(Map.entry(1, 2), Map.entry(3, 4));
- Initializes an immutable Map<Integer, Integer> with two initial key-value entries.
Map<Integer, Integer> mutableMap = new HashMap<>(immutableMap);
- Initializes a mutable Map<Integer, Integer> from an immutable Map<Integer, Integer>.

Syntax:

static <E> List<E> of()
static <E> List<E> of(E e1)
static <E> List<E> of(E e1, E e2)
static <E> List<E> of(E e1, E e2, ..., E e9, E e10)
static <E> List<E> of(E... elements)
static <E> Set<E> of()
static <E> Set<E> of(E e1)
static <E> Set<E> of(E e1, E e2)
static <E> Set<E> of(E e1, E e2, ..., E e9, E e10)
static <E> Set<E> of(E... elements)
static <K,V> Map<K,V> of()
static <K,V> Map<K,V> of(K k1, V v1)
static <K,V> Map<K,V> of(K k1, V v1, K k2, V v2)
static <K,V> Map<K,V> of(K k1, V v1, K k2, V v2, ..., K k9, V v9, K k10, V v10)
static <K,V> Map<K,V> ofEntries(Map.Entry<? extends K,? extends V>... entries)

Parameters:

Method w/ Parameter	Description
`List.of(E e)`	A generic type that can be a class or interface.
`Set.of(E e)`	A generic type that can be a class or interface.
`Map.of(K k, V v)`	A key-value pair of generic types that can each be a class or interface.
`Map.of(Map.Entry<? extends K, ? extends V> entry)`	A `Map.Entry` instance where its key can be `K` or one of its children, and its value can be `V` or any of its children.

Contributors

Topic Id: 9783

Example Ids: 30133,30134,30135

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