

For more information, refer to Open, close, and move projects. When you open a project, you have to choose whether to open it in a new window or to close the current project and open a new one instead.

Unlike NetBeans, IntelliJ IDEA cannot open multiple projects in the same window. NetBeans projects are more like IntelliJ IDEA modules.
HOW TO INSTALL MAVEN LIBRARY NETBEANS CODE
IntelliJ IDEA creates a project for an entire code base and a module for each of its individual components. The following table maps the most important NetBeans concepts to IntelliJ IDEA ones. NetBeans and IntelliJ IDEA use different names for similar entities.
HOW TO INSTALL MAVEN LIBRARY NETBEANS HOW TO
If you use one of these build tools, refer to Maven and Gradle for more details on how to work with them in IntelliJ IDEA. IntelliJ IDEA is fully integrated with Maven and Gradle. If you used NetBeans with Ant, IntelliJ IDEA will recognize Ant build scripts in your projects, and the Ant build scripts found notification will appear. nbproject directory and the build.xml file will remain untouched, and you'll be able to use IntelliJ IDEA along with NetBeans. This is used to store the IntelliJ IDEA project settings such as VCS settings, inspection profiles, or code styles. In the Open Project dialog that opens, click New Window. If you are using Maven with NetBeans, and you want to import a Maven project into IntelliJ IDEA, select your project's pom.xml. In the dialog that opens, select the directory in which your sources, libraries, and other assets are located and click Open. Otherwise, from the main menu, select File | Open.

This section covers some IntelliJ IDEA-specific aspects. Switching from NetBeans to IntelliJ IDEA requires understanding some differences between the two IDEs.
