BAEL 2330

* Implementing Hexagonal Architecture in java

* Removing duplicates from a string

* Fix for the code review feedback
- removing the hexagonal architecture code
- removing the methods removeDuplicatesUsingCharArray
- adding some meaningful sentences to test

* Fix for the code review feedback
- fix for removeDuplicatesUsingCharArray
- adding unit testing
- adding brackets around for loops

* Fix for the code review feedback

* Adding remove duplicates using java 8 distinct
adding assets to the unittests to test for empty strings

* Checking for empty strings in unit tests
Adding an if statement to check whether an empty string is passed to removeDuplicatesUsingSorting method

java-strings/src/main/java/com/baeldung/stringduplicates/RemoveDuplicateFromString.java

@@ -44,16 +44,16 @@ public class RemoveDuplicateFromString {
     }
 
     String removeDuplicatesUsingSorting(String str) {
-
-        char[] chars = str.toCharArray();
-
-        Arrays.sort(chars);
-
         StringBuilder sb = new StringBuilder();
-        sb.append(chars[0]);
-        for (int i = 1; i < chars.length; i++) {
-            if (chars[i] != chars[i - 1]) {
-                sb.append(chars[i]);
+        if(!str.isEmpty()) {
+            char[] chars = str.toCharArray();
+            Arrays.sort(chars);
+
+            sb.append(chars[0]);
+            for (int i = 1; i < chars.length; i++) {
+                if (chars[i] != chars[i - 1]) {
+                    sb.append(chars[i]);
+                }
             }
         }
 
@@ -90,6 +90,13 @@ public class RemoveDuplicateFromString {
         return sb.toString();
     }
 
+
+    String removeDuplicatesUsingDistinct(String str) {
+        StringBuilder sb = new StringBuilder();
+        str.chars().distinct().forEach(c -> sb.append((char) c));
+        return sb.toString();
+    }
+
 }