BAEL-1330 Primitive Type Streams in Java 8 (#3106)

* initial commit for first article evaluation

* fixed compilation error

* removed final keywords for compliance

* added unit tests and refactored as needed

* refactored application-context.xml to use self-closing tags

* renamed tests to use UnitTest suffix

* removed unnecessary annotation

* added code samples for primitive streams

* removed sample code and tests for evaluation article

* renamed unit test to proper unit test naming

* added a test to show boxed method

* added the assertion to the test fox boxed

* changed mapToInt test to use Arrays.asList instead of a POJO as per Grzegorz and Eugen

core-java-8/src/main/java/com/baeldung/stream/PrimitiveStreams.java

@@ -0,0 +1,23 @@
+package com.baeldung.stream;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+
+class PrimitiveStreams {
+
+    int min(int[] integers) {
+        return Arrays.stream(integers).min().getAsInt();
+    }
+
+    int max(int... integers) {
+        return IntStream.of(integers).max().getAsInt();
+    }
+
+    int sum(int... integers) {
+        return IntStream.of(integers).sum();
+    }
+
+    double avg(int... integers) {
+        return IntStream.of(integers).average().getAsDouble();
+    }
+}