OpenJDK 1.22 · java.util.OptionalInt · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private static final OptionalInt	EMPTY Common instance for `empty()`.
private final boolean	isPresent If true then the value is present, otherwise indicates no value is present
private final int	value

Access	Constructor and Description
private	OptionalInt() Construct an empty instance.
private	OptionalInt(int the int value to describe value) Construct an instance with the described value.

Method Summary

Modifier and Type	Method and Description
public static OptionalInt	Returns: an empty `OptionalInt` empty() Returns an empty `OptionalInt` instance.
public boolean	Returns: `true` if the other object is "equal to" this object otherwise `false` equals(Object an object to be tested for equality obj) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this `OptionalInt`.
public int	Returns: the value described by this `OptionalInt` getAsInt() If a value is present, returns the value, otherwise throws `NoSuchElementException`.
public int	Returns: hash code value of the present value or `0` if no value is present hashCode() Overrides java.lang.Object.hashCode. Returns the hash code of the value, if present, otherwise `0` (zero) if no value is present.
public void	ifPresent(IntConsumer the action to be performed, if a value is present action) If a value is present, performs the given action with the value, otherwise does nothing.
public void	ifPresentOrElse(IntConsumer the action to be performed, if a value is present action, Runnable the empty-based action to be performed, if no value is present emptyAction) If a value is present, performs the given action with the value, otherwise performs the given empty-based action.
public boolean	Returns: `true` if a value is not present, otherwise `false` isEmpty() If a value is not present, returns `true`, otherwise `false`.
public boolean	Returns: `true` if a value is present, otherwise `false` isPresent() If a value is present, returns `true`, otherwise `false`.
public static OptionalInt	Returns: an `OptionalInt` with the value present of(int the value to describe value) Returns an `OptionalInt` describing the given value.
public int	Returns: the value, if present, otherwise `other` orElse(int the value to be returned, if no value is present other) If a value is present, returns the value, otherwise returns `other`.
public int	Returns: the value, if present, otherwise the result produced by the supplying function orElseGet(IntSupplier the supplying function that produces a value to be returned supplier) If a value is present, returns the value, otherwise returns the result produced by the supplying function.
public int	Returns: the value described by this `OptionalInt` orElseThrow() If a value is present, returns the value, otherwise throws `NoSuchElementException`.
public < Type of the exception to be thrown X extends Throwable> int	Returns: the value, if present orElseThrow(Supplier<? extends X> the supplying function that produces an exception to be thrown exceptionSupplier) If a value is present, returns the value, otherwise throws an exception produced by the exception supplying function.
public IntStream	Returns: the optional value as an `IntStream` stream() If a value is present, returns a sequential `IntStream` containing only that value, otherwise returns an empty `IntStream`.
public String	Returns: the string representation of this instance toString() Overrides java.lang.Object.toString. Returns a non-empty string representation of this `OptionalInt` suitable for debugging.

Inherited from java.lang.Object:: clone finalize getClass notify notifyAll wait wait wait

EMPTY	back to summary
private static final OptionalInt EMPTY Common instance for `empty()`.

isPresent	back to summary
private final boolean isPresent If true then the value is present, otherwise indicates no value is present

value	back to summary
private final int value

OptionalInt	back to summary
private OptionalInt() Construct an empty instance. Implementation Note Generally only one empty instance, `OptionalInt#EMPTY`, should exist per VM.

OptionalInt	back to summary
private OptionalInt(int value) Construct an instance with the described value. Parameters value:int the int value to describe

Method Detail

empty back to summary

empty	back to summary
public static OptionalInt empty() Returns an empty `OptionalInt` instance. No value is present for this `OptionalInt`. API Note Though it may be tempting to do so, avoid testing if an object is empty by comparing with `==` or `!=` against instances returned by `OptionalInt.empty()`. There is no guarantee that it is a singleton. Instead, use `isEmpty()` or `isPresent()`. Returns:OptionalInt an empty `OptionalInt`

public static OptionalInt empty()

Returns an empty OptionalInt instance. No value is present for this OptionalInt.

API Note

Though it may be tempting to do so, avoid testing if an object is empty by comparing with == or != against instances returned by OptionalInt.empty(). There is no guarantee that it is a singleton. Instead, use isEmpty() or isPresent().

Returns:OptionalInt: an empty OptionalInt

equals back to summary

equals	back to summary
public boolean equals(Object obj) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this `OptionalInt`. The other object is considered equal if: it is also an `OptionalInt` and; both instances have no value present or; the present values are "equal to" each other via `==`. Parameters obj:Object an object to be tested for equality Returns:boolean `true` if the other object is "equal to" this object otherwise `false` Annotations @Override

public boolean equals(Object obj)

Overrides java.lang.Object.equals.

Indicates whether some other object is "equal to" this OptionalInt. The other object is considered equal if:

it is also an OptionalInt and;
both instances have no value present or;
the present values are "equal to" each other via ==.

Parameters

obj:Object: an object to be tested for equality

Returns:boolean

true if the other object is "equal to" this object otherwise false

Annotations

@Override

getAsInt back to summary

getAsInt	back to summary
public int getAsInt() If a value is present, returns the value, otherwise throws `NoSuchElementException`. API Note The preferred alternative to this method is `orElseThrow()`. Returns:int the value described by this `OptionalInt` Exceptions NoSuchElementException: if no value is present

public int getAsInt()

If a value is present, returns the value, otherwise throws NoSuchElementException.

API Note

The preferred alternative to this method is orElseThrow().

Returns:int

the value described by this OptionalInt

Exceptions

NoSuchElementException:: if no value is present

hashCode back to summary

hashCode	back to summary
public int hashCode() Overrides java.lang.Object.hashCode. Returns the hash code of the value, if present, otherwise `0` (zero) if no value is present. Returns:int hash code value of the present value or `0` if no value is present Annotations @Override

public int hashCode()

Overrides java.lang.Object.hashCode.

Returns the hash code of the value, if present, otherwise 0 (zero) if no value is present.

Returns:int

hash code value of the present value or 0 if no value is present

Annotations

@Override

ifPresent back to summary

ifPresent	back to summary
public void ifPresent(IntConsumer action) If a value is present, performs the given action with the value, otherwise does nothing. Parameters action:IntConsumer the action to be performed, if a value is present Exceptions NullPointerException: if value is present and the given action is `null`

public void ifPresent(IntConsumer action)

If a value is present, performs the given action with the value, otherwise does nothing.

Parameters

action:IntConsumer: the action to be performed, if a value is present

Exceptions

NullPointerException:: if value is present and the given action is null

ifPresentOrElse back to summary

ifPresentOrElse	back to summary
public void ifPresentOrElse(IntConsumer action, Runnable emptyAction) If a value is present, performs the given action with the value, otherwise performs the given empty-based action. Parameters action:IntConsumer the action to be performed, if a value is present emptyAction:Runnable the empty-based action to be performed, if no value is present Exceptions NullPointerException: if a value is present and the given action is `null`, or no value is present and the given empty-based action is `null`. Since 9

public void ifPresentOrElse(IntConsumer action, Runnable emptyAction)

If a value is present, performs the given action with the value, otherwise performs the given empty-based action.

Parameters

action:IntConsumer: the action to be performed, if a value is present
emptyAction:Runnable: the empty-based action to be performed, if no value is present

Exceptions

NullPointerException:: if a value is present and the given action is null, or no value is present and the given empty-based action is null.

Since

isEmpty back to summary

isEmpty	back to summary
public boolean isEmpty() If a value is not present, returns `true`, otherwise `false`. Returns:boolean `true` if a value is not present, otherwise `false` Since 11

public boolean isEmpty()

If a value is not present, returns true, otherwise false.

Returns:boolean: true if a value is not present, otherwise false
Since: 11

isPresent back to summary

isPresent	back to summary
public boolean isPresent() If a value is present, returns `true`, otherwise `false`. Returns:boolean `true` if a value is present, otherwise `false`

public boolean isPresent()

If a value is present, returns true, otherwise false.

Returns:boolean: true if a value is present, otherwise false

of back to summary

of	back to summary
public static OptionalInt of(int value) Returns an `OptionalInt` describing the given value. Parameters value:int the value to describe Returns:OptionalInt an `OptionalInt` with the value present

public static OptionalInt of(int value)

Returns an OptionalInt describing the given value.

Parameters

value:int: the value to describe

Returns:OptionalInt

an OptionalInt with the value present

orElse back to summary

orElse	back to summary
public int orElse(int other) If a value is present, returns the value, otherwise returns `other`. Parameters other:int the value to be returned, if no value is present Returns:int the value, if present, otherwise `other`

public int orElse(int other)

If a value is present, returns the value, otherwise returns other.

Parameters

other:int: the value to be returned, if no value is present

Returns:int

the value, if present, otherwise other

orElseGet back to summary

orElseGet	back to summary
public int orElseGet(IntSupplier supplier) If a value is present, returns the value, otherwise returns the result produced by the supplying function. Parameters supplier:IntSupplier the supplying function that produces a value to be returned Returns:int the value, if present, otherwise the result produced by the supplying function Exceptions NullPointerException: if no value is present and the supplying function is `null`

public int orElseGet(IntSupplier supplier)

If a value is present, returns the value, otherwise returns the result produced by the supplying function.

Parameters

supplier:IntSupplier: the supplying function that produces a value to be returned

Returns:int

the value, if present, otherwise the result produced by the supplying function

Exceptions

NullPointerException:: if no value is present and the supplying function is null

orElseThrow back to summary

orElseThrow	back to summary
public int orElseThrow() If a value is present, returns the value, otherwise throws `NoSuchElementException`. Returns:int the value described by this `OptionalInt` Exceptions NoSuchElementException: if no value is present Since 10

public int orElseThrow()

If a value is present, returns the value, otherwise throws NoSuchElementException.

Returns:int

the value described by this OptionalInt

Exceptions

NoSuchElementException:: if no value is present

Since

orElseThrow back to summary

orElseThrow	back to summary
public <X extends Throwable> int orElseThrow(Supplier<? extends X> exceptionSupplier) throws Supplier-:X If a value is present, returns the value, otherwise throws an exception produced by the exception supplying function. API Note A method reference to the exception constructor with an empty argument list can be used as the supplier. For example, `IllegalStateException::new` Parameters <X> Type of the exception to be thrown exceptionSupplier:Supplier<? extends X> the supplying function that produces an exception to be thrown Returns:int the value, if present Exceptions Supplier-:X: if no value is present NullPointerException: if no value is present and the exception supplying function is `null`

public <X extends Throwable> int orElseThrow(Supplier<? extends X> exceptionSupplier) throws Supplier-:X

If a value is present, returns the value, otherwise throws an exception produced by the exception supplying function.

API Note

A method reference to the exception constructor with an empty argument list can be used as the supplier. For example, IllegalStateException::new

Parameters

<X>: Type of the exception to be thrown
exceptionSupplier:Supplier<? extends X>: the supplying function that produces an exception to be thrown

Returns:int

the value, if present

Exceptions

Supplier-:X:: if no value is present
NullPointerException:: if no value is present and the exception supplying function is null

stream back to summary

stream	back to summary
public IntStream stream() If a value is present, returns a sequential `IntStream` containing only that value, otherwise returns an empty `IntStream`. API Note This method can be used to transform a `Stream` of optional integers to an `IntStream` of present integers: `Stream<OptionalInt> os = .. IntStream s = os.flatMapToInt(OptionalInt::stream)` Returns:IntStream the optional value as an `IntStream` Since 9

public IntStream stream()

If a value is present, returns a sequential IntStream containing only that value, otherwise returns an empty IntStream.

API Note

This method can be used to transform a Stream of optional integers to an IntStream of present integers:

Stream<OptionalInt> os = ..
    IntStream s = os.flatMapToInt(OptionalInt::stream)

Returns:IntStream: the optional value as an IntStream
Since: 9

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Returns a non-empty string representation of this `OptionalInt` suitable for debugging. The exact presentation format is unspecified and may vary between implementations and versions. Implementation Specification If a value is present the result must include its string representation in the result. Empty and present `OptionalInt`s must be unambiguously differentiable. Returns:String the string representation of this instance Annotations @Override

public String toString()

Overrides java.lang.Object.toString.

Returns a non-empty string representation of this OptionalInt suitable for debugging. The exact presentation format is unspecified and may vary between implementations and versions.

Implementation Specification

If a value is present the result must include its string representation in the result. Empty and present OptionalInts must be unambiguously differentiable.

Returns:String

the string representation of this instance

Annotations

@Override

public final Class OptionalInt

Field Summary

Constructor Summary

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Field Detail

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