Added in API level 24

Summary: Enums | Methods | Inherited Methods

Collector.Characteristics

public static final enum Collector.Characteristics
extends Enum<Collector.Characteristics>

java.lang.Object
↳	java.lang.Enum<java.util.stream.Collector.Characteristics>
	↳	java.util.stream.Collector.Characteristics

Characteristics indicating properties of a Collector, which can be used to optimize reduction implementations.

Summary

Enum values
`Collector.Characteristics`	`CONCURRENT` Indicates that this collector is concurrent, meaning that the result container can support the accumulator function being called concurrently with the same result container from multiple threads.
`Collector.Characteristics`	`IDENTITY_FINISH` Indicates that the finisher function is the identity function and can be elided.
`Collector.Characteristics`	`UNORDERED` Indicates that the collection operation does not commit to preserving the encounter order of input elements.

Public methods
`static Collector.Characteristics`	`valueOf(String name)`
`static final Characteristics[]`	`values()`

Inherited methods

From class


        
          java.lang.Enum

`final Object`	`clone()` Throws CloneNotSupportedException.
`final int`	`compareTo(Collector.Characteristics o)` Compares this enum with the specified object for order.
`final boolean`	`equals(Object other)` Returns true if the specified object is equal to this enum constant.
`final void`	`finalize()` enum classes cannot have finalize methods.
`final Class<Collector.Characteristics>`	`getDeclaringClass()` Returns the Class object corresponding to this enum constant's enum type.
`final int`	`hashCode()` Returns a hash code for this enum constant.
`final String`	`name()` Returns the name of this enum constant, exactly as declared in its enum declaration.
`final int`	`ordinal()` Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero).
`String`	`toString()` Returns the name of this enum constant, as contained in the declaration.
`static <T extends Enum<T>> T`	`valueOf(Class<T> enumClass, String name)` Returns the enum constant of the specified enum class with the specified name.

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface


        
          java.lang.Comparable


      compareTo(Collector.Characteristics o)

Compares this object with the specified object for order.

Enum values

CONCURRENT

Added in API level 24

public static final Collector.Characteristics CONCURRENT

Indicates that this collector is concurrent, meaning that the result container can support the accumulator function being called concurrently with the same result container from multiple threads.

If a CONCURRENT collector is not also UNORDERED, then it should only be evaluated concurrently if applied to an unordered data source.

IDENTITY_FINISH

Added in API level 24

public static final Collector.Characteristics IDENTITY_FINISH

Indicates that the finisher function is the identity function and can be elided. If set, it must be the case that an unchecked cast from A to R will succeed.

UNORDERED

Added in API level 24

public static final Collector.Characteristics UNORDERED

Indicates that the collection operation does not commit to preserving the encounter order of input elements. (This might be true if the result container has no intrinsic order, such as a Set.)

Public methods

valueOf

public static Collector.Characteristics valueOf (String name)

Parameters
`name`	`String`

Returns
`Collector.Characteristics`

values

public static final Characteristics[] values ()

Returns
`Characteristics[]`

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Collector.Characteristics

Summary

Enum values

Public methods

Inherited methods

Enum values

CONCURRENT

IDENTITY_FINISH

UNORDERED

Public methods

valueOf

values

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