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Showing content from http://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/function/UnaryOperator.html below:

UnaryOperator (Java SE 15 & JDK 15)

Type Parameters:

T - the type of the operand and result of the operator

All Superinterfaces:

Function<T,​T>

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 UnaryOperator<T>
extends Function<T,​T>

Represents an operation on a single operand that produces a result of the same type as its operand. This is a specialization of

for the case where the operand and result are of the same type.

This is a functional interface whose functional method is Function.apply(Object).

Since:

1.8

See Also:

Function

• Method Summary Static Methods Modifier and Type Method Description static <T> UnaryOperator<T> identity()

  Returns a unary operator that always returns its input argument.

• Method Details
  • identity

    Returns a unary operator that always returns its input argument.

    Type Parameters:

    T - the type of the input and output of the operator

    Returns:

    a unary operator that always returns its input argument

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