Added ArraySort Comparator function

src/com/ds/ArraySortComparator.java

@@ -0,0 +1,28 @@
+public static String sortString(String inputString) 
+{ 
+    // convert input string to Character array 
+    Character tempArray[] = new Character[inputString.length()]; 
+    for (int i = 0; i < inputString.length(); i++) { 
+        tempArray[i] = inputString.charAt(i); 
+    } 
+
+
+    // Sort, ignoring case during sorting 
+    Arrays.sort(tempArray, new Comparator<Character>(){ 
+
+        @Override
+        public int compare(Character c1, Character c2) 
+        { 
+            // ignoring case 
+            return Character.compare(Character.toLowerCase(c1), 
+                                    Character.toLowerCase(c2)); 
+        } 
+    }); 
+
+    // using StringBuilder to convert Character array to String 
+    StringBuilder sb = new StringBuilder(tempArray.length); 
+    for (Character c : tempArray) 
+        sb.append(c.charValue()); 
+
+    return sb.toString(); 
+}