Java 17 features (T-Z) (#15576)

- 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.xmppclient/src/main/java/org/openhab/binding/xmppclient/internal/XMPPClientHandlerFactory.java

@@ -12,7 +12,6 @@
  */
 package org.openhab.binding.xmppclient.internal;
 
-import java.util.Collections;
 import java.util.Set;
 
 import org.openhab.binding.xmppclient.internal.handler.XMPPClientHandler;
@@ -32,8 +31,8 @@ import org.osgi.service.component.annotations.Component;
  */
 @Component(configurationPid = "binding.xmppclient", service = ThingHandlerFactory.class)
 public class XMPPClientHandlerFactory extends BaseThingHandlerFactory {
-    private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections
-            .singleton(XMPPClientBindingConstants.BRIDGE_TYPE_XMPP);
+    private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Set
+            .of(XMPPClientBindingConstants.BRIDGE_TYPE_XMPP);
 
     @Override
     public boolean supportsThingType(ThingTypeUID thingTypeUID) {

bundles/org.openhab.binding.xmppclient/src/main/java/org/openhab/binding/xmppclient/internal/handler/XMPPClientHandler.java

@@ -14,9 +14,9 @@ package org.openhab.binding.xmppclient.internal.handler;
 
 import java.io.IOException;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
 import org.jivesoftware.smack.SmackException;
@@ -57,7 +57,7 @@ public class XMPPClientHandler extends BaseBridgeHandler {
 
     @Override
     public Collection<Class<? extends ThingHandlerService>> getServices() {
-        return Collections.singleton(XMPPActions.class);
+        return Set.of(XMPPActions.class);
     }
 
     @Override