Java 17 features (H-M) (#15520)

- 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
- remove null check before instanceof

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

bundles/org.openhab.binding.modbus.studer/src/main/java/org/openhab/binding/modbus/studer/internal/StuderHandler.java

@@ -106,7 +106,6 @@ public class StuderHandler extends BaseThingHandler {
 
     @Override
     public void handleCommand(ChannelUID channelUID, Command command) {
-
         // Currently we do not support any commands
     }
 
@@ -132,7 +131,6 @@ public class StuderHandler extends BaseThingHandler {
      * Start the periodic polling
      */
     private void startUp() {
-
         connectEndpoint();
 
         if (comms == null || config == null) {
@@ -203,9 +201,8 @@ public class StuderHandler extends BaseThingHandler {
             return null;
         }
 
-        if (handler instanceof ModbusEndpointThingHandler) {
-            ModbusEndpointThingHandler slaveEndpoint = (ModbusEndpointThingHandler) handler;
-            return slaveEndpoint;
+        if (handler instanceof ModbusEndpointThingHandler thingHandler) {
+            return thingHandler;
         } else {
             logger.debug("Unexpected bridge handler: {}", handler);
             return null;

bundles/org.openhab.binding.modbus.studer/src/main/java/org/openhab/binding/modbus/studer/internal/StuderParser.java

@@ -207,7 +207,7 @@ public class StuderParser {
      * @return the converted float
      */
     public @Nullable Float hexToFloat(String hex) {
-        String t = hex.replaceAll(" ", "");
+        String t = hex.replace(" ", "");
         float f = Float.intBitsToFloat((int) Long.parseLong(t, 16));
         if (Float.isNaN(f)) {
             return null;