Module java.base
Package java.util.function

Interface DoubleUnaryOperator

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

    Modifier and Type
    Method
    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 Details

    • 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