在Java 8中使用功能接口 [英] Use of Functional Interface in Java 8

问题描述

这是Java 8中 ::(双冒号）运算符的后续问题其中Java允许您使用 :: 运算符引用方法。

This is a follow up question from :: (double colon) operator in Java 8 in which Java allows you to refer to methods using :: operator.

是否可以提供我创建的一些自定义功能接口，并将其与 :: 运算符一起使用？怎么做？

Is it possible to provide some custom Functional Interface that I create and use it with :: operator? And how to do it?

推荐答案

是否可以提供我创建的一些自定义功能接口，并将其与一起使用:: 运营商？怎么做？

"Is it possible to provide some custom Functional Interface that I create and use it with :: operator? And how to do it?"

这是可能的，它就像你想象的那样简单：只需用一种方法创建一个界面。你甚至不需要 @FunctionalInterface 注释;这个注释只记录你的意图并帮助在编译时检测错误，类似于 @Override 。

It is possible and it’s as easy as you could imagine: just create an interface with exactly one method. You don’t even need the @FunctionalInterface annotation; this annotation just documents your intention and helps detecting errors at compile time similar to @Override.

所以也许你已经已经在你的Java 8之前的项目中创建了这样的接口...

So maybe you already have created such interfaces in your pre-Java 8 projects…

class Foo {
    // nothing new:
    public interface FooFactory {
        Foo createFoo();
    }
    // new in Java 8:
    public static final FooFactory DEFAULT_FACTORY = Foo::new;
}

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