IntelliJ IDEA Java IDE

IntelliJ IDEA is a powerful integrated development environment for Java and JVM-based languages, developed by JetBrains (founded in 2000 by Sergey Dmitriev, based in Prague). Available in free Community Edition and paid Ultimate Edition, IntelliJ IDEA is used by millions of developers at Google, Amazon, and Netflix. Key features: deep code understanding building a comprehensive code model enabling intelligent completion, refactoring, navigation, and analysis that understands Java syntax, semantics, and framework conventions. Smart completion with context-aware code suggestions filtered by expected types, variable scope, and chain completion with statistics-based ranking. Comprehensive refactoring including rename, extract method, inline, move, change signature, and extract interface with project-wide safe application. First-class support for Spring Framework, Spring Boot, Jakarta EE, Hibernate, JPA, Micronaut, Quarkus, and Reactor with dedicated tooling. Built-in Git, SVN, Mercurial, Perforce, and GitHub integration with visual diff and merge conflict resolution. Built-in database explorer with SQL editor and query execution in Ultimate Edition. Powerful debugger with inline variable values, expression evaluation, stream tracing for Java Streams, and remote debugging. Maven, Gradle, and Ant integration with auto-import and dependency management. JUnit, TestNG, and Spock test runner with inline results and coverage reports. Built-in async profiler, CPU profiler, and memory profiler in Ultimate Edition. Over 1,000 built-in inspections detecting bugs, performance issues, and code smells with quick fixes. Built-in REST API testing HTTP client.