Lambda Expressions - Java 8 Recipes - page 204

lists the functional interfaces that are contained within the java.util.function
package, along with a description of each. Note that a Predicate test that returns a
Boolean value.

Table 6-1 . Functional Interfaces Contained in java.util.function

Interface Implementation Description

Function operation that accepts two input arguments and
returns no result.

BiConsumer<T,U>

Function that accepts two arguments and produces a res-
ult.

BiFunction<T,U,R>

Function operation upon two operands of the same type,
producing a result of the same type as the operands.

BinaryOperator<T>

Predicate of two arguments. Returns a Boolean value.

BiPredicate<T,U>

BooleanSupplier Supplier of Boolean-valued results.

Function operation that accepts a single input argument
and returns no result.

Consumer<T>

Function operation upon two double -valued operands
and producing a double -valued result.

DoubleBinaryOperator

Function operation that accepts a single double -valued
argument and returns no result.

DoubleConsumer

Function that accepts a double -valued argument and
produces a result.

DoubleFunction<R>

Predicate of one double -valued argument.

DoublePredicate

Supplier of double -valued results.

DoubleSupplier

DoubleToIntFunction Function that accepts a double-valued argument and pro-

duces an int -valued result.

Function that accepts a double-valued argument and pro-
duces a long -valued result.

DoubleToLongFunction

Function operation on a single double -valued operand
that produces a double -valued result.

DoubleUnaryOperator

Function that accepts one argument and produces a result.

Function<T,R>

Function operation upon two int -valued operands and
producing an int -valued result.

IntBinaryOperator