Java 17 features (N-S) (#15565)

- 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.systeminfo/src/main/java/org/openhab/binding/systeminfo/internal/discovery/SysteminfoDiscoveryService.java

@@ -16,7 +16,6 @@ import static org.openhab.binding.systeminfo.internal.SysteminfoBindingConstants
 
 import java.net.InetAddress;
 import java.net.UnknownHostException;
-import java.util.Collections;
 import java.util.Set;
 
 import org.eclipse.jdt.annotation.NonNullByDefault;
@@ -46,7 +45,7 @@ public class SysteminfoDiscoveryService extends AbstractDiscoveryService {
 
     private final Logger logger = LoggerFactory.getLogger(SysteminfoDiscoveryService.class);
 
-    private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections.singleton(THING_TYPE_COMPUTER);
+    private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Set.of(THING_TYPE_COMPUTER);
 
     private static final int DISCOVERY_TIME_SECONDS = 30;
     private static final String THING_UID_VALID_CHARS = "A-Za-z0-9_-";
@@ -82,7 +81,6 @@ public class SysteminfoDiscoveryService extends AbstractDiscoveryService {
 
     protected String getHostName() throws UnknownHostException {
         InetAddress addr = InetAddress.getLocalHost();
-        String hostname = addr.getHostName();
-        return hostname;
+        return addr.getHostName();
     }
 }

bundles/org.openhab.binding.systeminfo/src/main/java/org/openhab/binding/systeminfo/internal/handler/SysteminfoHandler.java

@@ -675,8 +675,7 @@ public class SysteminfoHandler extends BaseThingHandler {
         }
 
         if (channelGroupID.contains(CHANNEL_GROUP_CURRENT_PROCESS)) {
-            int pid = systeminfo.getCurrentProcessID();
-            return pid;
+            return systeminfo.getCurrentProcessID();
         }
 
         // First try to get device index in group id, delete all non-digits from id