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How to implement lambda expression in JShell in Java 9?

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Release： 2023-08-20 18:29:02
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如何在Java 9的JShell中实现lambda表达式？

JShell 是Java的第一个REPL 和命令行工具，提供对Java编程语言元素的交互使用。我们可以使用这个工具在类的隔离环境中测试功能。 JShell 在命令行中创建了一个简单而易用的编程环境，它接收用户的输入，读取并打印结果。 lambda表达式是一种不属于任何类的创建的函数。

在下面的示例中，我们可以在JShell中实现一个lambda表达式。

<strong>C:\Users\User>jshell
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro

jshell> Consumer<String> s = (String s) -> System.out.println(s)
s ==> $Lambda$14/1268066861@3159c4b8</strong>
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如果我们记不住Consumer 接口的方法，那么输入一个已创建的变量的名称，然后加上点并按下Tab键。它会显示可以在Consumer 接口上调用的方法列表。

<strong>jshell> s.
accept( andThen( equals( getClass() hashCode()
notify() notifyAll() toString() wait(

jshell> s.accept("Welcome to Tutorialspoint")
Welcome to Tutorialspoint</strong>
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