Java 使用 Stream API 在每个对象上调用方法的“好”方法
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"Good" method to call method on each object using Stream API
提问by Jofkos
Is it possible to run a method, in a consumer, like a method reference, but on the object passed to the consumer:
是否可以在消费者中运行一个方法，就像方法引用一样，但是在传递给消费者的对象上：
Arrays.stream(log.getHandlers()).forEach(h -> h.close());
would be a thing like:
会是这样的：
Arrays.stream(log.getHandlers()).forEach(this::close);
but that's not working...
但这不起作用......
Is there a possibility with method references, or is x -> x.method()the only way working here?
方法引用是否有可能，或者是x -> x.method()唯一的方法在这里工作？
采纳答案by Eran
You don't need this. YourClassName::closewill call the closemethod on the object passed to the consumer :
你不需要this. YourClassName::close将调用close传递给消费者的对象的方法：
Arrays.stream(log.getHandlers()).forEach(YourClassName::close);
There are four kinds of method references (Source):
有四种方法引用（Source）：
Kind Example
---- -------
Reference to a static method ContainingClass::staticMethodName
Reference to an instance method of a particular object containingObject::instanceMethodName
Reference to an instance method of an arbitrary object of a particular type ContainingType::methodName
Reference to a constructor ClassName::new
In your case, you need the third kind.
在你的情况下，你需要第三种。
回答by Edwin Dalorzo
I suppose it should be:
我想应该是：
Arrays.stream(log.getHandlers()).forEach(Handler::close);
Provided the log.getHandlers()returns an array of objects of type Handler.
提供log.getHandlers()返回类型为 的对象数组Handler。
回答by matsev
Sure, but you must use the correct syntax of method reference, i.e. pass the class to which the close()method belong:
当然可以，但是您必须使用方法引用的正确语法，即传递close()方法所属的类：
Arrays.stream(log.getHandlers()).forEach(Handler::close);
