Add Module Import

[Flashky]

JDK 24 feature (preview)

Currently in JDK 23 preview, it is possible to automatically import all most common java classes by adding:

import module java.base;

Before this feature, importing the a List and an ArrayList would require two imports:

import java.util.List;
import java.util.ArrayList;
//...
List<String> myList = new ArrayList<>();

Or just import java.util.*, but the compiler would warn you about having a not needed import.

With this feature:

import module java.base;
//...
List<String> myList = new ArrayList<>();

If there is no List at the code, there won't be any import warnings.

IntelliJ IDEA configuration

IntelliJ can be configured at Settings / Editor / File and Code Templates to include by default the import module java.base statement at newly created classes:

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};

#end
import module java.base;

#parse("File Header.java")
public class ${NAME} {
}

That way, newly created classes can start using collection classes right away from start.

More information

https://foojay.io/today/java-23-has-arrived-and-it-brings-a-truckload-of-changes/
https://openjdk.org/jeps/476