对我来说，它是IDEA的maven支持，特别是在版本9中是首屈一指的。项目与maven模型的动态同步非常棒，使开发变得愉快。

有很多事情是idea用更简单的方法解决的，或者没有等价的方法:

Autocomplete actions: Doing ctrl+shift+a you can call any idea action from the keyboard without remembering its key combination... Think about gnome-do or launchy in windows, and you've got the idea! Also, this feature supports CamelCasing abbreviations ;) Shelf: Lets you keep easily some pieces of code apart, and then review them through the diff viewer. Local history: It's far better managed, and simpler. SVN annotations and history: simpler to inspect, and also you can easily see the history only for such a part of a whole source file. Autocomplete everywhere, such as the evaluate expression and breakpoint condition windows. Maven integration... much, much simpler, and well integrated. Refactors much closer to the hand, such as loops insertion, wrapping/casting, renaming, and add variables. Find much powerful and well organized. Even in big projects Much stable to work with several branches of a big project at the same time (as a former bugfixer of 1.5Gb by branch sources, and the need to working in them simultaneously, idea shown its rock-solid capabilities) Cleaner and simpler interface... And, simpler to use only with the keyboard, letting apart the need of using the mouse for lots of simple taks, saving you time and giving you more focus on the code... where it matters!

现在，作为开源的…Idea的用户群将呈指数级增长。

首先，我喜欢intellij。它至少有100个eclipse所缺乏的特性。在重构、重命名、移动和其他已经提到过的东西时，我所说的可靠性和智能程度是任何夸张都无法形容的。

但是，有一件事intellij不允许，而eclipse做到了。它不允许在同一个vm下同时运行多个项目。

当你有独立的前端、中间、核心、代理项目时…等等，它们都必须相互交互，你不能同时快速修改和调试。我目前处理这个问题的唯一方法是使用ant脚本在依赖的项目中部署和更新jar，或者使用maven。

Eclipse允许在一个ide vm实例下调试多个项目。

IntelliJ有一些相当高级的代码检查(与FindBugs类似但又不同)。

虽然我在使用IntelliJ时非常想念FindBugs插件(Eclipse/FindBugs集成非常酷)。

下面是IntelliJ支持的代码检查的官方列表

编辑:最后，IntelliJ有一个findbugs-plugin。它仍处于测试阶段，但代码检查和FindBugs的组合非常棒!

多得多的重构。

IntelliJ调试器有一个非常方便的特性，叫做“表达式计算”，这比eclipses pendant好得多。它有完整的代码完成，我认为它通常“更有用”。