diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 7b35802..2a74bcb 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -36,4 +36,12 @@ jobs:
 
       - name: Check code formatting
         run: |
-          git diff --name-only ${{ github.base_ref }} | grep '\.kt$' | xargs ktlint --relative .
\ No newline at end of file
+          git diff --name-only ${{ github.base_ref }} | grep '\.kt$' | xargs ktlint --relative .
+
+      - name: Install Checkstyle
+        run: |
+          curl -L -o checkstyle.zip https://github.com/checkstyle/checkstyle/releases/download/checkstyle-8.44/checkstyle-8.44-all.jar
+          unzip checkstyle.zip
+
+      - name: Check Java code formatting
+        run: java -jar checkstyle-8.44-all.jar -c sun_checks.xml $(find . -name '*.java')