Java 支持柯里化吗? [英] Does Java support Currying?

问题描述

我想知道是否有任何方法可以在 Java 中提取它.我认为没有对闭包的原生支持是不可能的.

I was wondering if there is any way to pull that in Java. I think it is not possible without native support for closures.

推荐答案

Java 8(2014 年 3 月 18 日发布)确实支持柯里化.missingfaktor的答案中发布的示例Java代码可以重写为:

Java 8 (released March 18th 2014) does support currying. The example Java code posted in the answer by missingfaktor can be rewritten as:

import java.util.function.*;
import static java.lang.System.out;

// Tested with JDK 1.8.0-ea-b75
public class CurryingAndPartialFunctionApplication
{
   public static void main(String[] args)
   {
      IntBinaryOperator simpleAdd = (a, b) -> a + b;
      IntFunction<IntUnaryOperator> curriedAdd = a -> b -> a + b;

      // Demonstrating simple add:
      out.println(simpleAdd.applyAsInt(4, 5));

      // Demonstrating curried add:
      out.println(curriedAdd.apply(4).applyAsInt(5));

      // Curried version lets you perform partial application:
      IntUnaryOperator adder5 = curriedAdd.apply(5);
      out.println(adder5.applyAsInt(4));
      out.println(adder5.applyAsInt(6));
   }
}

...这是相当不错的.就我个人而言，在 Java 8 可用的情况下，我认为没有什么理由使用替代的 JVM 语言，例如 Scala 或 Clojure.当然，它们提供其他语言功能，但这不足以证明转换成本和较弱的 IDE/工具/库支持(IMO)是合理的.

... which is quite nice. Personally, with Java 8 available I see little reason to use an alternative JVM language such as Scala or Clojure. They provide other language features, of course, but that's not enough to justify the transition cost and the weaker IDE/tooling/libraries support, IMO.

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