BAEL-865 - updated example code (#2029)

* added project files for evaluation article by smatt382@gmail.com

* added project files for evaluation article by smatt382@gmail.com

* added class com.baeldung.string.StringToCharStream by smatt382@gmail.com

* updated the example codes. Use assert statements

* updated example codes

* fixed conflict in pom.xml

* remove redundant files'

* added unit test

core-java/src/main/java/com/baeldung/string/StringToCharStream.java

@@ -0,0 +1,46 @@
+package com.baeldung.string;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+/**
+ * Created by smatt on 26/05/2017.
+ */
+public class StringToCharStream {
+
+    public StringToCharStream() {
+
+             //let's use the Stream API to manipulate a string
+            //this will count the occurrence of each character in the test string
+
+            System.out.println("Counting Occurrence of Letter");
+            String testString = "Noww";
+
+            //we don't want to use foreach, so . . .
+
+            Map<Character, Integer> map = new HashMap<>();
+
+            testString.codePoints()
+              .mapToObj(c -> (char) c)
+              .filter(c -> Character.isLetter(c))
+              .forEach(c -> {
+                if(map.containsKey(c)) {
+                  map.put(c, map.get(c) + 1);
+                } else {
+                  map.put(c, 1);
+                }
+              });
+
+            //printing out the result here
+            System.out.println(map.toString());
+    }
+
+
+    public static void main(String [] args) {
+        new StringToCharStream();
+    }
+
+
+}