T - 操作输入的类型
@FunctionalInterface public interface Consumer<T>
Consumer预计将通过副作用进行操作。
这是一个functional interface的功能方法是accept(Object) 。
void accept(T t)
t - 输入参数
default Consumer<T> andThen(Consumer<? super T> after)
Consumer , Consumer执行该操作,后跟after操作。
如果执行任一操作会抛出异常,它将被转发到组合操作的调用者。
如果执行此操作抛出一个异常, after操作将不被执行。
after - 此操作后执行的操作
Consumer按顺序执行该操作,后跟
after操作
NullPointerException - if
after is null
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