Bring Powersort to Java

Gradle

Setup

Dependencies (JDK23, Gradle, IntelliJ) can be installed by running nix-shell.

Commandline

Check which Java toolchains Gradle finds:

./gradlew javaToolchains

This should include version >= 23, e.g.:

 + N/A JDK 23-ga
     | Location:           /nix/store/48290hnlb13xmwjw9y16a1s785993bv7-openjdk-23-ga/lib/openjdk
     | Language Version:   23
     | Vendor:             N/A
     | Architecture:       amd64
     | Is JDK:             true
     | Detected by:        Current JVM

IntelliJ

When using nix-shell, some configuration is necessary:

• STRG ALT SHIFT s -> SDK -> add JDK ->
  • home path: /usr/lib/openjdk
  • name: usr-lib-jdk
• STRG ALT s -> build tools -> gradle ->
  • local installation: /usr/lib/gradle
  • Gradle JVM: usr-lib-jdk

Tasks

List all Gradle tasks which can be run:

./gradlew tasks

This can also be done graphically in IntelliJ:

Test Cases

Run the task "test":

./gradlew test

TimSort

Imported from

• src/java.base/share/classes/java/util/TimSort.java
• src/java.base/share/classes/java/util/ComparableTimSort.java