how to create a java library in intellij

To create a Java library in IntelliJ IDEA, follow these steps:

1. Open IntelliJ IDEA and click on Create New Project.
2. In the New Project window, select Java from the list of options on the left.
3. Select Java Library from the list of project types.
4. Click on Next.
5. In the Name and Location page, specify the name and location of your project.
6. Click on Finish to create the project.

IntelliJ IDEA will create a new project with a default package structure and a few files, including a build.gradle file that is used to configure the build process.

You can then start adding Java source code to your library by creating new packages and classes. To create a new package, right-click on the src directory in the project tree and select New | Package. To create a new class, right-click on the package and select New | Class.

You can also add dependencies to your library by adding them to the build.gradle file. For example, to add the Apache Commons Lang library as a dependency, you can add the following line to the dependencies block in the build.gradle file:

compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.11'

To build your library, you can use the Build | Build Project command from the menu. This will compile your source code and create a JAR file that can be used as a library in other projects.

You can also publish your library to a repository such as Maven Central by following the instructions in the IntelliJ IDEA documentation.