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.dwdpollenflug/src/main/java/org/openhab/binding/dwdpollenflug/internal/handler/DWDPollenflugBridgeHandler.java

@@ -170,9 +170,8 @@ public class DWDPollenflugBridgeHandler extends BaseBridgeHandler {
 
     @Override
     public void childHandlerInitialized(ThingHandler childHandler, Thing childThing) {
-        if (childHandler instanceof DWDPollenflugRegionHandler) {
+        if (childHandler instanceof DWDPollenflugRegionHandler regionListener) {
             logger.debug("Register region listener.");
-            final DWDPollenflugRegionHandler regionListener = (DWDPollenflugRegionHandler) childHandler;
             if (regionListeners.add(regionListener)) {
                 final DWDPollenflug localPollenflug = pollenflug;
                 if (localPollenflug != null) {
@@ -187,9 +186,9 @@ public class DWDPollenflugBridgeHandler extends BaseBridgeHandler {
 
     @Override
     public void childHandlerDisposed(ThingHandler childHandler, Thing childThing) {
-        if (childHandler instanceof DWDPollenflugRegionHandler) {
+        if (childHandler instanceof DWDPollenflugRegionHandler handler) {
             logger.debug("Unregister region listener.");
-            if (!regionListeners.remove((DWDPollenflugRegionHandler) childHandler)) {
+            if (!regionListeners.remove(handler)) {
                 logger.warn("Tried to remove listener {} but it was not registered. This is probably an error.",
                         childHandler);
             }

bundles/org.openhab.binding.dwdpollenflug/src/main/java/org/openhab/binding/dwdpollenflug/internal/handler/DWDPollenflugRegionHandler.java

@@ -66,8 +66,7 @@ public class DWDPollenflugRegionHandler extends BaseThingHandler {
         Bridge bridge = getBridge();
         if (bridge != null) {
             ThingHandler handler = bridge.getHandler();
-            if (handler instanceof DWDPollenflugBridgeHandler) {
-                DWDPollenflugBridgeHandler bridgeHandler = (DWDPollenflugBridgeHandler) handler;
+            if (handler instanceof DWDPollenflugBridgeHandler bridgeHandler) {
                 return bridgeHandler;
             }
         }