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Java Standard Edition (SE)

DoubleUnaryOperator


compact1, compact2, compact3
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 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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