关于函数式FunctionalInterface介绍的文章

## 关于函数式FunctionalInterface介绍的文章

• java8学习总结——函数式接口@FunctionalInterface
• Java 8 函数式接口 – Functional Interface

* Java8 — 函数式接口@FunctionalInterface及default关键字

JDK 8里面的FunctionalInterface列表

简要说明：

* BiConsumer<T, U>

/**
     * Performs this operation on the given arguments.
     *
     * @param t the first input argument
     * @param u the second input argument
     */
    void accept(T t, U u);

• BiFunction<T, U, R>

/**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument
     * @param u the second function argument
     * @return the function result
     */
    R apply(T t, U u);

• BinaryOperator extends BiFunction<T,T,T>

public static <T> BinaryOperator<T> minBy(
    Comparator<? super T> comparator) {
        Objects.requireNonNull(comparator);
        return (a, b) -> comparator.compare(a, b) <= 0 ? a : b;
    }

• BiPredicate<T, U>

/**
     * Evaluates this predicate on the given arguments.
     *
     * @param t the first input argument
     * @param u the second input argument
     * @return {@code true} if the input arguments match the predicate,
     * otherwise {@code false}
     */
    boolean test(T t, U u);

• BooleanSupplier

/**
     * Gets a result.
     *
     * @return a result
     */
    boolean getAsBoolean();

• Consumer

/**
     * Performs this operation on the given argument.
     *
     * @param t the input argument
     */
    void accept(T t);

• DoubleBinaryOperator

/**
     * Applies this operator to the given operands.
     *
     * @param left the first operand
     * @param right the second operand
     * @return the operator result
     */
    double applyAsDouble(double left, double right);

• DoubleConsumer

/**
     * Performs this operation on the given argument.
     *
     * @param value the input argument
     */
    void accept(double value);

• DoubleFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    R apply(double value);

• DoublePredicate

/**
     * Evaluates this predicate on the given argument.
     *
     * @param value the input argument
     * @return {@code true} if the input argument matches the predicate,
     * otherwise {@code false}
     */
    boolean test(double value);

• DoubleSupplier

/**
     * Gets a result.
     *
     * @return a result
     */
    double getAsDouble();

• DoubleToIntFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    int applyAsInt(double value);

• DoubleToLongFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    long applyAsLong(double value);

• DoubleUnaryOperator

/**
     * Applies this operator to the given operand.
     *
     * @param operand the operand
     * @return the operator result
     */
    double applyAsDouble(double operand);

• Function<T, R>

/**
     * Applies this function to the given argument.
     *
     * @param t the function argument
     * @return the function result
     */
    R apply(T t);

• IntBinaryOperator

/**
     * Applies this operator to the given operands.
     *
     * @param left the first operand
     * @param right the second operand
     * @return the operator result
     */
    int applyAsInt(int left, int right);

• IntConsumer

/**
     * Performs this operation on the given argument.
     *
     * @param value the input argument
     */
    void accept(int value);

• IntFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    R apply(int value);

• IntPredicate

/**
     * Evaluates this predicate on the given argument.
     *
     * @param value the input argument
     * @return {@code true} if the input argument matches the predicate,
     * otherwise {@code false}
     */
    boolean test(int value);

• IntSupplier

/**
     * Gets a result.
     *
     * @return a result
     */
    int getAsInt();

• IntToDoubleFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    double applyAsDouble(int value);

• IntToLongFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    long applyAsLong(int value);

• IntUnaryOperator

/**
     * Applies this operator to the given operand.
     *
     * @param operand the operand
     * @return the operator result
     */
    int applyAsInt(int operand);

• LongBinaryOperator

/**
     * Applies this operator to the given operands.
     *
     * @param left the first operand
     * @param right the second operand
     * @return the operator result
     */
    long applyAsLong(long left, long right);

• LongConsumer

/**
     * Performs this operation on the given argument.
     *
     * @param value the input argument
     */
    void accept(long value);

• LongFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    R apply(long value);

• LongPredicate

/**
     * Evaluates this predicate on the given argument.
     *
     * @param value the input argument
     * @return {@code true} if the input argument matches the predicate,
     * otherwise {@code false}
     */
    boolean test(long value);

• LongSupplier

/**
     * Gets a result.
     *
     * @return a result
     */
    long getAsLong();

• LongToDoubleFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    double applyAsDouble(long value);

• LongToIntFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    int applyAsInt(long value);

• LongUnaryOperator

/**
     * Applies this operator to the given operand.
     *
     * @param operand the operand
     * @return the operator result
     */
    long applyAsLong(long operand);

• ObjDoubleConsumer

/**
     * Performs this operation on the given arguments.
     *
     * @param t the first input argument
     * @param value the second input argument
     */
    void accept(T t, double value);

• ObjIntConsumer

/**
     * Performs this operation on the given arguments.
     *
     * @param t the first input argument
     * @param value the second input argument
     */
    void accept(T t, int value);

• ObjLongConsumer

/**
     * Performs this operation on the given arguments.
     *
     * @param t the first input argument
     * @param value the second input argument
     */
    void accept(T t, long value);

• Predicate

/**
     * Evaluates this predicate on the given argument.
     *
     * @param t the input argument
     * @return {@code true} if the input argument matches the predicate,
     * otherwise {@code false}
     */
    boolean test(T t);

• Supplier

/**
     * Gets a result.
     *
     * @return a result
     */
    T get();

• ToDoubleBiFunction<T, U>

/**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument
     * @param u the second function argument
     * @return the function result
     */
    double applyAsDouble(T t, U u);

• ToDoubleFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    double applyAsDouble(T value);

• ToIntBiFunction<T, U>

/**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument
     * @param u the second function argument
     * @return the function result
     */
    int applyAsInt(T t, U u);

• ToIntFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    int applyAsInt(T value);

• ToLongBiFunction<T, U>

/**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument
     * @param u the second function argument
     * @return the function result
     */
    long applyAsLong(T t, U u);

• ToLongFunction

/**
     * Applies this function to the given argument.
     *
     * @param value the function argument
     * @return the function result
     */
    long applyAsLong(T value);

• UnaryOperator extends Function<T, T>

/**
     * Returns a unary operator that always returns its input argument.
     *
     * @param <T> the type of the input and output of the operator
     * @return a unary operator that always returns its input argument
     */
    static <T> UnaryOperator<T> identity() {
        return t -> t;
    }