problem statement commented in the code

UniqueCharacters.java

@@ -14,4 +14,18 @@ public static void main(String[] args){
          System.out.println(temp);
          sc.close();
     }
-}
+}
+
+/*
+Problem Statement
+Write a Java program to print the unique characters present in the given string in the same sequence as they appear(the first occurrence) in the input.
+
+Note:
+All the characters should be in lowercase only.
+
+i/p -> 
+xperience
+
+o/p -> 
+xperinc
+*/