From f1cfc706df085310b50fcd3df1f9690e34d8257c Mon Sep 17 00:00:00 2001
From: anton-k11 <anton.krosnev@gmail.com>
Date: Tue, 20 Sep 2016 17:59:43 +0300
Subject: [PATCH] Adding Optional 2 Stream and Set.of examples.

---
 .../baeldung/java9/OptionalToStreamTest.java  | 21 +++++++++++++++
 .../com/baeldung/java9/SetExamplesTest.java   | 27 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java
 create mode 100644 core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java

diff --git a/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java b/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java
new file mode 100644
index 0000000000..966c03fe17
--- /dev/null
+++ b/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java
@@ -0,0 +1,21 @@
+package com.baeldung.java9;
+
+import java.util.Optional;
+import java.util.stream.Stream;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+public class OptionalToStreamTest {
+    
+    @Test
+    public void testOptionalToStream(){
+        Optional<String> op = Optional.ofNullable("String value");
+        Stream<String> strOptionalStream = op.stream();
+        Stream<String> filteredStream = strOptionalStream.filter(
+               (str) -> { return str != null && str.startsWith("String"); }
+               );
+        assertEquals(1, filteredStream.count());
+        
+    }
+}
diff --git a/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java b/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java
new file mode 100644
index 0000000000..c534ba9d47
--- /dev/null
+++ b/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java
@@ -0,0 +1,27 @@
+package com.baeldung.java9;
+
+
+import java.util.Set;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class SetExamplesTest {
+
+    @Test
+    public void testUnmutableSet(){
+        Set<String> strKeySet = Set.of("key1", "key2", "key3");
+        try{
+            strKeySet.add("newKey");
+        }catch(UnsupportedOperationException uoe){          
+        }
+        assertEquals(strKeySet.size(), 3); 
+    }
+    
+    @Test
+    public void testArrayToSet(){
+        Integer [] intArray = new Integer[]{1,2,3,4,5,6,7,8,9,0};
+        Set<Integer> intSet = Set.of(intArray);
+        assertEquals(intSet.size(), intArray.length);
+    }
+}