Java Lambda 表达式 [英] Java Lambda expressions

问题描述

Java 8 中添加了 Lambda 表达式.我想了解为什么这很重要.对于尚未接触函数式编程习语的 Java 程序员来说，这意味着什么?这是否意味着我可以编写性能更好或可大规模扩展的代码，还是只会使代码不那么冗长.或者全部.

Lambda expressions are being added in Java 8. I want to understand why this is important. What does it mean to a Java programmer who is yet to be exposed to functional programming idioms? Does it mean I can write code that performs better or scales massively or does it only make the code less verbose. Or all of it.

推荐答案

Oracle 已有教程 回到正题.它列出了几个很好的用例.

Oracle already has tutorial up on the topic. It lists several great uses cases.

在我找到链接之前，我想说的是 lambda 表达式允许您将函数"传递给代码.因此，您可以更轻松地编写代码，而过去我们需要为之编写一大堆接口/抽象类.例如，假设您的代码具有一些复杂的循环/条件逻辑或工作流.在某一阶段，您想做一些不同的事情.使用 lambda 表达式，您只需传入不同的东西"即可.阅读教程.很清楚.

Before I found the link, I was going to say that lambda expressions let you pass "functions" to code. So you can write code more easily that we used to need a whole mess of interfaces/abstract classes for. For example, suppose you have code that has some complex loop/conditional logic or workflow. At one step you want to do something different. With lambda expressions, you can just pass in that "something different." Read the tutorial though. It's very clear.

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