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Consumer ​

Consumer接口表示一个消费者，它接受一个泛型类型参数T，但不返回任何结果。

java
@FunctionalInterface
public interface Consumer<T> {

    /**
     * Performs this operation on the given argument.
     * 对于给定参数执行操作
     * @param t the input argument
     */
    void accept(T t);

    /**
     * Returns a composed {@code Consumer} that performs, in sequence, this
     * operation followed by the {@code after} operation. If performing either
     * operation throws an exception, it is relayed to the caller of the
     * composed operation.  If performing this operation throws an exception,
     * the {@code after} operation will not be performed.
     * 组合两个消费者，按照当前消费者和给定消费者顺序执行操作
     * @param after the operation to perform after this operation
     * @return a composed {@code Consumer} that performs in sequence this
     * operation followed by the {@code after} operation
     * @throws NullPointerException if {@code after} is null
     */
    default Consumer<T> andThen(Consumer<? super T> after) {
        Objects.requireNonNull(after);
        return (T t) -> { accept(t); after.accept(t); };
    }
}

JDK中的使用场景 ​

扩展接口 ​