DoubleUnaryOperator (Java Platform SE 8 )

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface DoubleUnaryOperator
```
Represents an operation on a single double-valued operand that produces a double-valued result. This is the primitive type specialization of UnaryOperator for double.
This is a functional interface whose functional method is applyAsDouble(double).

Since:

1.8

See Also:

UnaryOperator

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`default DoubleUnaryOperator`	`andThen(DoubleUnaryOperator after)` Returns a composed operator that first applies this operator to its input, and then applies the `after` operator to the result.
`double`	`applyAsDouble(double operand)` Applies this operator to the given operand.
`default DoubleUnaryOperator`	`compose(DoubleUnaryOperator before)` Returns a composed operator that first applies the `before` operator to its input, and then applies this operator to the result.
`static DoubleUnaryOperator`	`identity()` Returns a unary operator that always returns its input argument.

- Method Detail
  - applyAsDouble
```
double applyAsDouble(double operand)
```
    Applies this operator to the given operand.
    
    Parameters:
    
    operand - the operand
    
    Returns:
    
    the operator result
  - compose
```
default DoubleUnaryOperator compose(DoubleUnaryOperator before)
```
    Returns a composed operator that first applies the before operator to its input, and then applies this operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.
    
    Parameters:
    
    before - the operator to apply before this operator is applied
    
    Returns:
    
    a composed operator that first applies the before operator and then applies this operator
    
    Throws:
    
    NullPointerException - if before is null
    
    See Also:
    
    andThen(DoubleUnaryOperator)
  - andThen
```
default DoubleUnaryOperator andThen(DoubleUnaryOperator after)
```
    Returns a composed operator that first applies this operator to its input, and then applies the after operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.
    
    Parameters:
    
    after - the operator to apply after this operator is applied
    
    Returns:
    
    a composed operator that first applies this operator and then applies the after operator
    
    Throws:
    
    NullPointerException - if after is null
    
    See Also:
    
    compose(DoubleUnaryOperator)
  - identity
```
static DoubleUnaryOperator identity()
```
    Returns a unary operator that always returns its input argument.
    
    Returns:
    
    a unary operator that always returns its input argument

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Interface DoubleUnaryOperator

Method Summary

Method Detail

applyAsDouble

compose

andThen

identity