Minor Improvements (#701)

* Minor Improvement:

* Add final variable.try to make the code read-only
* inline Variable. Simplify code

* Update UnicodeUnpairedSurrogateRemover.java

Better comment.

Co-authored-by: Gary Gregory <garydgregory@users.noreply.github.com>

src/main/java/org/apache/commons/lang3/text/translate/UnicodeUnpairedSurrogateRemover.java

@@ -34,12 +34,9 @@ public class UnicodeUnpairedSurrogateRemover extends CodePointTranslator {
      */
     @Override
     public boolean translate(final int codepoint, final Writer out) throws IOException {
-        if (codepoint >= Character.MIN_SURROGATE && codepoint <= Character.MAX_SURROGATE) {
-            // It's a surrogate. Write nothing and say we've translated.
-            return true;
-        }
+        // true: It's a surrogate. Write nothing and say we've translated.
+        return codepoint >= Character.MIN_SURROGATE && codepoint <= Character.MAX_SURROGATE;
         // It's not a surrogate. Don't translate it.
-        return false;
     }
 }
 

src/main/java/org/apache/commons/lang3/time/FastDateParser.java

@@ -820,8 +820,8 @@ public class FastDateParser implements DateParser, Serializable {
         private final Map<String, TzInfo> tzNames= new HashMap<>();
 
         private static class TzInfo {
-            TimeZone zone;
-            int dstOffset;
+            final TimeZone zone;
+            final int dstOffset;
 
             TzInfo(final TimeZone tz, final boolean useDst) {
                 zone = tz;