Open Project Wizard, in the left-hand pane select Gradle.
In the right-hand pane, IntelliJ IDEA automatically adds a project SDK (JDK) and a default option Java in the Additional Libraries and Frameworks area. You can edit this information if you like. Click Next.
On the next page of the wizard let's specify ArtifactId which basically is the name of our project. We can use the default information in the version field. Unless we plan to deploy our project in some Maven repository we don't need to specify a GroupId. Click Next.
We've already specified our project's name, let's specify the location of our project and click Finish.
IntelliJ IDEA creates a project with the build.gradle file and the src folder with main and test subdirectories.
IntelliJ IDEA also creates a dedicated tool window with default tasks.
For more information on creating a Gradle project with the options that are out of this scope, refer to Gradle.
Add Java and test classes to a Gradle project
In the Project tool window open the src folder.
Right-click the main or test directory then the java subdirectory and from the list select New | Java Class.
In the Create New Class dialog specify the name of your Java or test class and click OK.
Add the following code for the HelloWorld class:
import java.io.PrintStream;
import static sun.misc.Version.print;
public class HelloWorld {
public static void main(String[] args) {
print(System.out);
}
public static void print(PrintStream out) {
out.println("Hello, World!");
}
}
Add the following code for the Test class:
import org.junit.Assert;
import org.junit.Test;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
public class MyTest {
@Test
public void name() throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
HelloWorld.print(new PrintStream(out));
String s = out.toString();
Assert.assertEquals("Hello", s);
}
}
Run your application in a Gradle project
In the editor, in the left gutter, press and select Run 'HelloWorld.main()'.
Check the result in the Run tool window.
Run tests in a Gradle project
We can run our test using several different ways:
the editor: click in the left gutter of the editor.
the test Gradle task: in the Gradle Projects tool window open the Tasks directory and then the verification subdirectory. In the list that opens, double-click test to run your test.
and select Run 'HelloWorld.main()'. 
