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.iammeter/src/main/java/org/openhab/binding/iammeter/internal/Iammeter3080THandler.java

@@ -45,7 +45,7 @@ public class Iammeter3080THandler extends IammeterBaseHandler {
         JsonObject iammeterData = iammeterDataElement.getAsJsonObject();
         String keyWord = "Datas";
         if (iammeterData.has("Datas") && iammeterData.has("SN")) {
-            String groups[] = { "powerPhaseA", "powerPhaseB", "powerPhaseC" };
+            String[] groups = { "powerPhaseA", "powerPhaseB", "powerPhaseC" };
             for (int row = 0; row < groups.length; row++) {
                 String gpName = groups[row];
                 List<Channel> chnList = getThing().getChannelsOfGroup(gpName);