Add support for multiple jdks (#368)

README.md

@@ -158,25 +158,18 @@ jobs:
 ```
 
 ### Install multiple JDKs
+
+All versions are added to the PATH. The last version will be used and available globally. Other Java versions can be accessed through env variables with such specification as 'JAVA_HOME_{{ MAJOR_VERSION }}_{{ ARCHITECTURE }}'.
+
 ```yaml
     steps:
       - uses: actions/setup-java@v3
         with:
           distribution: '<distribution>'
-          java-version: 8
-      - run: echo "JAVA_8=$JAVA_HOME" >> $GITHUB_ENV
-  
-      - uses: actions/setup-java@v3
-        with:
-          distribution: '<distribution>'
-          java-version: 11
-      - run: echo "JAVA_11=$JAVA_HOME" >> $GITHUB_ENV
-  
-      - uses: actions/setup-java@v3
-        with:
-          distribution: '<distribution>'
-          java-version: 15
-      - run: echo "JAVA_15=$JAVA_HOME" >> $GITHUB_ENV
+          java-version: |
+            8
+            11
+            15
 ```
 
 ### Advanced