Java 17 features (A-G) (#15516)

- add missing @override
- Java style array syntax
- remove redundant modifiers
- always move String constants to left side in comparisons
- simplify lambda expressions and return statements
- use replace instead of replaceAll w/o regex
- instanceof matching and multiline strings

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.binding.fronius/src/main/java/org/openhab/binding/fronius/internal/handler/FroniusBridgeHandler.java

@@ -93,8 +93,8 @@ public class FroniusBridgeHandler extends BaseBridgeHandler {
 
     @Override
     public void childHandlerInitialized(ThingHandler childHandler, Thing childThing) {
-        if (childHandler instanceof FroniusBaseThingHandler) {
-            this.services.add((FroniusBaseThingHandler) childHandler);
+        if (childHandler instanceof FroniusBaseThingHandler handler) {
+            this.services.add(handler);
             restartAutomaticRefresh();
         } else {
             logger.debug("Child handler {} not added because it is not an instance of FroniusBaseThingHandler",