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.dwdunwetter/src/main/java/org/openhab/binding/dwdunwetter/internal/factory/DwdUnwetterHandlerFactory.java

@@ -14,7 +14,6 @@ package org.openhab.binding.dwdunwetter.internal.factory;
 
 import static org.openhab.binding.dwdunwetter.internal.DwdUnwetterBindingConstants.THING_TYPE_WARNINGS;
 
-import java.util.Collections;
 import java.util.Set;
 
 import org.eclipse.jdt.annotation.NonNullByDefault;
@@ -36,7 +35,7 @@ import org.osgi.service.component.annotations.Component;
 @Component(configurationPid = "binding.dwdunwetter", service = ThingHandlerFactory.class)
 public class DwdUnwetterHandlerFactory extends BaseThingHandlerFactory {
 
-    private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections.singleton(THING_TYPE_WARNINGS);
+    private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Set.of(THING_TYPE_WARNINGS);
 
     @Override
     public boolean supportsThingType(ThingTypeUID thingTypeUID) {

bundles/org.openhab.binding.dwdunwetter/src/test/java/org/openhab/binding/dwdunwetter/internal/handler/DwdUnwetterHandlerTest.java

@@ -137,7 +137,7 @@ public class DwdUnwetterHandlerTest extends JavaTest {
     private String getLabel(NodeList nodeList) {
         for (int i = 0; i < nodeList.getLength(); i++) {
             Node node = nodeList.item(i);
-            if (node.getNodeName().equals("label")) {
+            if ("label".equals(node.getNodeName())) {
                 return node.getTextContent();
             }
         }