IntelliJ IDEA 2021 for Java & Kotlin Developers

Learn to comment code in Java, XML, and YAML with line and block comments, using keyboard shortcuts to comment and uncomment across multiple lines.

Refactor safely by introducing a string to string hash map for replacements and iterating the map to apply changes, with tests ensuring behavior stays consistent.

Explore type migrations and constructor signature changes by converting a price field from a wrapper to a primitive double, previewing impacted locations, and cleaning up the pay method.

Open the find dialog with ctrl+shift+f to search the entire project or a custom scope, preview results, refine with file mask filters, and review matches in the find window.

Explore using regular expressions for search and replace in a comma-separated file, matching a date with capture groups and reformatting it to a dash-delimited pattern via replacements.

Explore viewing type and method hierarchies in IntelliJ IDEA 2021 for Java and Kotlin developers. Navigate between superclasses, subclasses, and method implementations using hierarchy shortcuts and the actions dialog.

Navigate large IntelliJ IDEA projects by using shortcuts to find files, classes, and symbols across modules and packages. Explore go-to-class and search-everywhere features, plus typing highlights and package views.

Access recently opened files with the recent files shortcut, scroll, or type to trim results. Use control shift plus you to view more context in the structure and module windows.

Open the favorites window, create a new list like code samples, and add files or packages to organize key Java files. Access favorites via shortcuts or the Find Action dialog.

Open the project window and press Ultan Insert to insert new angular dependencies or angular schematics to generate, for example, a new cloth inside our app folder.

Access maven settings quickly in the Maven settings dialog in IntelliJ, adjust output level, thread count, and maven version (bundled or wrapper), and configure a custom settings XML for proxies.

Use the Maven tool window to view the effective POM and generate a dependencies diagram, identifying transitive dependencies and classpath conflicts, then apply exclusions to prevent loaded dependencies.

Open the git tool window in IntelliJ IDEA to view local and remote branches and commit history with diffs; filter by user, date, or path.

Switch to a new branch in IntelliJ to develop a web API endpoint, use git checkout to switch, create a local branch, and mark favorites to keep them on top.

Customize the version control color scheme to distinguish changed lines, including blue and green indicators, with options for color blindness and custom colors in the editor settings.

Explore shelf and stash workflows in IntelliJ: switch branches with local changes, resolve conflicts, and manage multiple change lists by shelving, unshelving, and applying changes later.

Customize pre-commit checks by enabling code reformatting, import optimization, and test runs; choose analyzer profiles and filter checks, enabling a lightweight Scotland profile before committing.

Explore how to amend commits, edit messages, and rewrite history with interactive rebase in IntelliJ, including squashing commits, rewording, and undoing unintended commits before opening a pull request.

Explore git submodules to manage multiple projects with linked repositories, like a JavaScript library used across apps. Learn cloning, updating, and syncing submodules, resolving detached head state, and version bumps.

Discover non suspending log breakpoints in IntelliJ IDEA 2021 to inspect variables without pausing. Hold shift and click the gutter to enable it, then evaluate values and use filters.

Evaluate expressions at breakpoints, add watches, and change variable values to enter the desired if branch during debugging in IntelliJ IDEA.

Learn to alter execution flow and return values in a Java debugging session with IntelliJ IDEA 2021, using breakpoints, simulate exceptions, and force custom returns.