Client and backend. Every class listed here is shared: the same code is compiled into your app and into your server. The package's page in the client API lists all of it, including any classes that exist only in the app.

package java.util.function

Types

`interface BiConsumer`	An operation on two values that answers nothing.
`interface BiFunction`	A function of two arguments.
`interface BiPredicate`	A test of two arguments; the two-argument form of `Predicate`.
`interface BinaryOperator`	An operation on two values of one type that answers that type.
`interface BooleanSupplier`	A source of `boolean` values; the `boolean` form of `Supplier`.
`interface Consumer`	An operation on one value that answers nothing.
`interface DoubleBinaryOperator`	An operation on two `double` values that answers a `double`; the `double` form of `BinaryOperator`.
`interface DoubleConsumer`	An operation on one `double` that answers nothing; the `double` form of `Consumer`.
`interface DoubleFunction`	A function of one `double`; the `double` form of `Function`.
`interface DoublePredicate`	A test of one `double`; the `double` form of `Predicate`.
`interface DoubleSupplier`	A source of `double` values; the `double` form of `Supplier`.
`interface DoubleToIntFunction`	A function of one `double` that answers a `int`.
`interface DoubleToLongFunction`	A function of one `double` that answers a `long`.
`interface DoubleUnaryOperator`	An operation on one `double` that answers a `double`; the `double` form of `UnaryOperator`.
`interface Function`	A function of one argument.
`interface IntBinaryOperator`	An operation on two `int` values that answers a `int`; the `int` form of `BinaryOperator`.
`interface IntConsumer`	An operation on one `int` that answers nothing; the `int` form of `Consumer`.
`interface IntFunction`	A function of one `int`; the `int` form of `Function`.
`interface IntPredicate`	A test of one `int`; the `int` form of `Predicate`.
`interface IntSupplier`	A source of `int` values; the `int` form of `Supplier`.
`interface IntToDoubleFunction`	A function of one `int` that answers a `double`.
`interface IntToLongFunction`	A function of one `int` that answers a `long`.
`interface IntUnaryOperator`	An operation on one `int` that answers a `int`; the `int` form of `UnaryOperator`.
`interface LongBinaryOperator`	An operation on two `long` values that answers a `long`; the `long` form of `BinaryOperator`.
`interface LongConsumer`	An operation on one `long` that answers nothing; the `long` form of `Consumer`.
`interface LongFunction`	A function of one `long`; the `long` form of `Function`.
`interface LongPredicate`	A test of one `long`; the `long` form of `Predicate`.
`interface LongSupplier`	A source of `long` values; the `long` form of `Supplier`.
`interface LongToDoubleFunction`	A function of one `long` that answers a `double`.
`interface LongToIntFunction`	A function of one `long` that answers a `int`.
`interface LongUnaryOperator`	An operation on one `long` that answers a `long`; the `long` form of `UnaryOperator`.
`interface ObjDoubleConsumer`	An operation on an object and a `double` that answers nothing; the `double` form of `BiConsumer`.
`interface ObjIntConsumer`	An operation on an object and a `int` that answers nothing; the `int` form of `BiConsumer`.
`interface ObjLongConsumer`	An operation on an object and a `long` that answers nothing; the `long` form of `BiConsumer`.
`interface Predicate`	A test of one value.
`interface Supplier`	A source of values.
`interface ToDoubleBiFunction`	A function of two arguments that answers a `double`; the `double` form of `BiFunction`.
`interface ToDoubleFunction`	A function that answers a `double`; the `double` form of `Function`.
`interface ToIntBiFunction`	A function of two arguments that answers a `int`; the `int` form of `BiFunction`.
`interface ToIntFunction`	A function that answers a `int`; the `int` form of `Function`.
`interface ToLongBiFunction`	A function of two arguments that answers a `long`; the `long` form of `BiFunction`.
`interface ToLongFunction`	A function that answers a `long`; the `long` form of `Function`.
`interface UnaryOperator`	An operation on one value that answers the same type.