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.ipobserver/src/main/java/org/openhab/binding/ipobserver/internal/IpObserverDiscoveryService.java

@@ -98,7 +98,7 @@ public class IpObserverDiscoveryService extends AbstractDiscoveryService {
                 InetAddress currentIP = InetAddress.getByAddress(ByteBuffer.allocate(4).putInt(i).array());
                 // Try to reach each IP with a timeout of 500ms which is enough for local network
                 if (currentIP.isReachable(500)) {
-                    String host = currentIP.getHostAddress().toString();
+                    String host = currentIP.getHostAddress();
                     logger.debug("Unknown device was found at: {}", host);
                     discoverySearchPool.execute(new IpObserverDiscoveryJob(this, host));
                 }