[java] simplify strings processing

java/src/dev/selenium/tools/modules/ModuleGenerator.java

@@ -60,6 +60,7 @@
 import java.nio.file.SimpleFileVisitor;
 import java.nio.file.StandardCopyOption;
 import java.nio.file.attribute.BasicFileAttributes;
+import java.nio.file.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashSet;
@@ -212,11 +213,9 @@ public static void main(String[] args) throws IOException {
     }
     if (result != 0) {
       throw new RuntimeException(
-          "Unable to process module:\n"
-              + "jdeps "
-              + String.join(" ", jdepsArgs)
-              + "\n"
-              + new String(bos.toByteArray()));
+          String.format(
+              "Unable to process module:%njdeps %s%n%s",
+              String.join(" ", jdepsArgs), bos.toString(StandardCharsets.UTF_8)));
     }
 
     AtomicReference<Path> moduleInfo = new AtomicReference<>();

java/src/org/openqa/selenium/Platform.java

@@ -447,7 +447,7 @@ public static Platform extractFromSysProperty(String osName, String osVersion) {
     String previousMatch = null;
     for (Platform os : Platform.values()) {
       for (String matcher : os.partOfOsName) {
-        if ("".equals(matcher)) {
+        if (matcher.isEmpty()) {
           continue;
         }
         matcher = matcher.toLowerCase(Locale.ENGLISH);

java/src/org/openqa/selenium/remote/codec/AbstractHttpCommandCodec.java

@@ -237,7 +237,7 @@ public HttpRequest encode(Command command) {
       byte[] data = content.getBytes(UTF_8);
 
       request.setHeader(HttpHeader.ContentLength.getName(), String.valueOf(data.length));
-      request.setHeader(HttpHeader.ContentType.getName(), JSON_UTF_8.toString());
+      request.setHeader(HttpHeader.ContentType.getName(), JSON_UTF_8);
       request.setContent(bytes(data));
     }