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.kostalinverter/src/main/java/org/openhab/binding/kostalinverter/internal/secondgeneration/SecondGenerationConfigurationHandler.java

@@ -59,8 +59,7 @@ public class SecondGenerationConfigurationHandler {
 
             sessionId = extractSessionId(getAuthenticateResponseJsonObject);
 
-            JsonObject authenticateJsonObject = JsonParser.parseString(getAuthenticateResponse.toString())
-                    .getAsJsonObject();
+            JsonObject authenticateJsonObject = JsonParser.parseString(getAuthenticateResponse).getAsJsonObject();
             salt = authenticateJsonObject.get("salt").getAsString();
 
             String saltedPassword = new StringBuilder(password).append(salt).toString();
@@ -120,9 +119,7 @@ public class SecondGenerationConfigurationHandler {
         int codeStartPosition = jsonResponse.indexOf("code");
         transformStringBuilder.insert(codeStartPosition + 11, ']');
 
-        String transformJsonObject = transformStringBuilder.toString();
-
-        return transformJsonObject;
+        return transformStringBuilder.toString();
     }
 
     // Method extractSessionId extracts sessionId from JsonObject

bundles/org.openhab.binding.kostalinverter/src/main/java/org/openhab/binding/kostalinverter/internal/secondgeneration/SecondGenerationHandler.java

@@ -103,10 +103,10 @@ public class SecondGenerationHandler extends BaseThingHandler {
                             valueConfiguration);
                     break;
                 case SecondGenerationBindingConstants.CHANNEL_SMARTBATTERYCONTROLSET:
-                    if (command.toString().equals("ON")) {
+                    if ("ON".equals(command.toString())) {
                         valueConfiguration = "true";
                     }
-                    if (command.toString().equals("OFF")) {
+                    if ("OFF".equals(command.toString())) {
                         valueConfiguration = "false";
                     }
                     dxsEntriesConf = "33556484";
@@ -288,10 +288,10 @@ public class SecondGenerationHandler extends BaseThingHandler {
                 String channel = cConfig.id;
                 String value = channelPostsConfigurable[channelValuesCounterConfigurable];
                 int dxsEntriesCheckCounter = 3;
-                if (cConfig.dxsEntries.equals("33556484")) {
+                if ("33556484".equals(cConfig.dxsEntries)) {
                     dxsEntriesCheckCounter = 1;
                 }
-                if (cConfig.dxsEntries.equals("33556482")) {
+                if ("33556482".equals(cConfig.dxsEntries)) {
                     dxsEntriesCheckCounter = 2;
                 }
                 switch (dxsEntriesCheckCounter) {