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Summary: Methods | Inherited Methods

OptionalDouble

public final class OptionalDouble
extends Object

java.lang.Object
↳	java.util.OptionalDouble

A container object which may or may not contain a double value. If a value is present, isPresent() will return true and getAsDouble() will return the value.

Additional methods that depend on the presence or absence of a contained value are provided, such as orElse() (return a default value if value not present) and ifPresent() (execute a block of code if the value is present).

Summary

Public methods
`static OptionalDouble`	`empty()` Returns an empty `OptionalDouble` instance.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this OptionalDouble.
`double`	`getAsDouble()` If a value is present in this `OptionalDouble`, returns the value, otherwise throws `NoSuchElementException`.
`int`	`hashCode()` Returns the hash code value of the present value, if any, or 0 (zero) if no value is present.
`void`	`ifPresent(DoubleConsumer consumer)` Have the specified consumer accept the value if a value is present, otherwise do nothing.
`boolean`	`isPresent()` Return `true` if there is a value present, otherwise `false`.
`static OptionalDouble`	`of(double value)` Return an `OptionalDouble` with the specified value present.
`double`	`orElse(double other)` Return the value if present, otherwise return `other`.
`double`	`orElseGet(DoubleSupplier other)` Return the value if present, otherwise invoke `other` and return the result of that invocation.
`<X extends Throwable> double`	`orElseThrow(Supplier<X> exceptionSupplier)` Return the contained value, if present, otherwise throw an exception to be created by the provided supplier.
`String`	`toString()` Returns a string representation of the object. Returns a non-empty string representation of this object suitable for debugging.

Inherited methods

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 timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public methods

empty

public static OptionalDouble empty ()

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

API Note:

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

Returns
`OptionalDouble`	an empty `OptionalDouble`.

equals

public boolean equals (Object obj)

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

it is also an OptionalDouble and;
both instances have no value present or;
the present values are "equal to" each other via Double.compare() == 0.

Parameters
`obj`	`Object`: an object to be tested for equality

Returns
`boolean`	{code true} if the other object is "equal to" this object otherwise `false`

getAsDouble

public double getAsDouble ()

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

Returns
`double`	the value held by this `OptionalDouble`

Throws
`NoSuchElementException`	if there is no value present

See also:

isPresent()

hashCode

public int hashCode ()

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

Returns
`int`	hash code value of the present value or 0 if no value is present

ifPresent

public void ifPresent (DoubleConsumer consumer)

Have the specified consumer accept the value if a value is present, otherwise do nothing.

Parameters
`consumer`	`DoubleConsumer`: block to be executed if a value is present

Throws
`NullPointerException`	if value is present and `consumer` is null

isPresent

public boolean isPresent ()

Return true if there is a value present, otherwise false.

Returns
`boolean`	`true` if there is a value present, otherwise `false`

of

public static OptionalDouble of (double value)

Return an OptionalDouble with the specified value present.

Parameters
`value`	`double`: the value to be present

Returns
`OptionalDouble`	an `OptionalDouble` with the value present

orElse

public double orElse (double other)

Return the value if present, otherwise return other.

Parameters
`other`	`double`: the value to be returned if there is no value present

Returns
`double`	the value, if present, otherwise `other`

orElseGet

public double orElseGet (DoubleSupplier other)

Return the value if present, otherwise invoke other and return the result of that invocation.

Parameters
`other`	`DoubleSupplier`: a `DoubleSupplier` whose result is returned if no value is present

Returns
`double`	the value if present otherwise the result of `other.getAsDouble()`

Throws
`NullPointerException`	if value is not present and `other` is null

orElseThrow

public double orElseThrow (Supplier<X> exceptionSupplier)

Return the contained value, if present, otherwise throw an exception to be created by the provided supplier.

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
`exceptionSupplier`	`Supplier`: The supplier which will return the exception to be thrown

Returns
`double`	the present value

Throws
	if there is no value present
`NullPointerException`	if no value is present and `exceptionSupplier` is null
`Throwable`

toString

public String toString ()

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())

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

Implementation Requirements:

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

Returns
`String`	the string representation of this instance

Interfaces

Classes

Enums

Exceptions

Errors

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OptionalDouble

Summary

Public methods

Inherited methods

Public methods

empty

API Note:

equals

getAsDouble

hashCode

ifPresent

isPresent

of

orElse

orElseGet

orElseThrow

API Note:

toString

Implementation Requirements: