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How to implement a map in JShell in Java 9?

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2023-09-06 12:17:02 1357browse

在Java 9的JShell中如何实现一个地图?

JShell是Java 9中引入的一个java shell工具。它是一个交互式工具,可以读取输入、执行它并在中打印它命令行提示符。我们不需要像Java类那样编写main()方法来执行它。

我们可以实现不同的集合包括setJShell 工具中的 >、listmap。重要的集合是Map接口,它是一个键值对。映射不包含重复键,并且每个键最多映射到一个值。

在下面的示例中,我们可以能够实现非空映射。

C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> Map map = new HashMap(); map ==> {} jshell> map.put("raja", "ramesh"); $2 ==> null jshell> map.put("adithya", "sai"); $3 ==> null jshell> map.put("jai", "dev"); $4 ==> null jshell> map.put("chaintaya", "krishna"); $5 ==> null jshell> Map immutableMap = Collections.unmodifiableMap(map); immutableMap ==> {raja=ramesh, jai=dev, chaintaya=krishna, adithya=sai} jshell>

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