IntelliJ IDEA 是一种商业化销售的Java集成开发环境（Integrated Development Environment，IDE）工具软件，由捷克软件公司JetBrains在2001年1 月时推出最初版。

IntelliJ IDEA 被认为是当前Java开发效率最快的IDE工具。

它整合了开发过程中实用的众多功能，几乎可以不用鼠标可以方便的完成你要做的任何事情，最大程度的加快开发的速度。

简单而又功能强大。

与其他的一些繁冗而复杂的IDE工具有鲜明的对比。

JetBrains IntelliJ IDEA Ultimate 2017.x | 527.4 MbDeep insight into your code.

IntelliJ IDEA analyzes your code, looking for connections between symbols across all project files and languages.

Using this information it provides indepth coding assistance, quick navigation, clever error analysis, and, of course, refactorings.

Deep insight into your code.

IntelliJ IDEA analyzes your code, looking for connections between symbols across all project files and languages.

Using this information it provides indepth coding assistance, quick navigation, clever error analysis, and, of course, refactorings.

Smart completionCtrl+Shift+Space gives you a list of the most relevant symbols applicable in the current context.

This and other completions are constantly learning from you, moving the members of the most frequently used classes and packages to the top of the suggestions list, so you can select them faster.

Chain completionDigs a tad deeper than Smart Completion and lists applicable symbols accessible via methods or getters in the current context.

Say you're looking for a value of Project and only have the Module module declaration.

Press Ctrl+Shift+Space twice to get module.

getProject() without any additional effort.

Static members completionLets you easily use static methods or constants.

Offers a list of symbols matching your input and automatically adds required import statements.

Data flow analysisWhen offering completion variants, IntelliJ IDEA analyses data flow to guess the possible runtime symbol type and refines choices based on that intel, automatically adding class casts.

Language injectionBrings coding assistance for a selected language to expressions and string literals in another one, complete with all advantages you would normally have.

For example, you can inject fragments of SQL, XPath, HTML, CSS, or JavaScript code into Java String literals.

Cross-language refactoringsKnowing everything about usages of a symbol, IntelliJ IDEA offers extremely effective, thorough refactorings.

For example, when you Rename a class within a JPA statement, it will update everything, from JPA entity class, to every JPA expression where it is used.

Detecting duplicatesFinds duplicate code fragments on the fly.

Even if you're only about to extract a variable, constant, or a method, IntelliJ IDEA will let you know that there is a similar code fragment that can be replaced along with the one you're woking on.

Inspections and quick-fixesWhenever IntelliJ IDEA detects that you're about to make a mistake, a little lightbulb pops up in the editor.

Clicking it or pressing Alt+Enter opens a list of actions you can take to make things right.

Developer ergonomicsEvery aspect of IntelliJ IDEA is designed with ergonomics in mind.

IntelliJ IDEA is built on a principle that every minute a developer spends in the flow is a good minute, and things that break developers out of that flow are bad and should be avoided.

Built-in developer toolsTo streamline your workflow, IntelliJ IDEA offers an unbeatable toolset right from the first start: decompiler, bytecode viewer, FTP and many more.

Polyglot experienceIn addition to Java, IntelliJ IDEA offers first-class support for top JVM and non-JVM frameworks and languages out of the box.

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