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IntelliJ IDEA Complete Download and Install Guide

Official Overview

IntelliJ IDEA is a  Java IDE for Professional Developers, it 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.

Ctrl+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.

Key Features

Static members completion
Lets you easily use static methods or constants. Offers a list of symbols matching your input and automatically adds required import statements.

Data flow analysis
When 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 injection
Brings 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 refactorings
Knowing 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 duplicates
Finds 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-fixes
Whenever 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.

Inline debugger
When you debug your code IntelliJ IDEA shows you variable values right in the source code, next to their usages.