撰写Java功能和消费者

问题描述

在功能上构成java Function 和 Consumer 的最佳方式是什么？
例如给出一些函数< Object，String> f 和一些消费者< String> c 然后做 f.and然后（c）会感觉自然，但这不是接口的工作方式。

我看到的两个选项是替换 Consumer< String> c 与函数< String，Void> c 或更改消费者< String> c 到 BiConsumer< Function< Object，String>，String> c 和do

  accept（函数< Object，String> f，Object o）{
 String thing = f.apply（o）; 
 //对事物做些事
} 
  

其中之一好于另一个？有没有更好的方法？

解决方案

这是你正在尝试做什么？

 消费者< Object> composed = o  - > c.accept（f.apply（O））; 
  

如果您发现自己遇到了这个问题，您可以使用静态方法来执行此操作）：

  static< T，R>消费者LT; T> applyAndAccept（Function<？super T，？extends R> f，Consumer< R> c）{
 return t  - > c.accept（f.apply（T））; 
} 
  

What is the best way to functionally compose a java Function and a Consumer?For example given some Function<Object, String> f and some Consumer<String> c then doing f.andThen(c) would feel natural, however that is not how the interfaces work.

The two options I see are either replace Consumer<String> c with Function<String, Void> c or change Consumer<String> c to BiConsumer<Function<Object, String>, String> c and do

accept(Function<Object, String> f, Object o) {
    String thing = f.apply(o);
    //do something with thing
}

Is one of these better than the other? Is there a better way?

解决方案

Is this what you are trying to do?

Consumer<Object> composed = o -> c.accept(f.apply(o));

If you find yourself faced with this problem a lot, you can make a static method to do this (but is it really worth it?):

static<T,R> Consumer<T> applyAndAccept(Function<? super T,? extends R> f, Consumer<R> c){
    return t -> c.accept(f.apply(t));
}

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