diff --git a/src/com/oracle/java8/professional/CollectionTest.java b/src/com/oracle/java8/professional/CollectionTest.java
new file mode 100644
index 0000000..abd4895
--- /dev/null
+++ b/src/com/oracle/java8/professional/CollectionTest.java
@@ -0,0 +1,52 @@
+package com.oracle.java8.professional;
+
+import com.oracle.java8.professional.collection.Impiegato;
+
+import java.util.*;
+
+public class CollectionTest {
+
+	public static void main(String[] args) {
+		iteratorForEach();
+		usingHashSet();
+		usingMap();
+	}
+
+	private static void iteratorForEach() {
+		System.out.println("\niteratorForEach");
+		List<String> people = Arrays.asList("Walter", "Skylar", "Jesse");
+		for (String name : people) {
+			System.out.println(name);
+		}
+	}
+
+	private static void usingHashSet() {
+		System.out.println("\nusingHashSet");
+		Set<Impiegato> impiegati = new HashSet<>();
+		impiegati.add(new Impiegato("Mario"));
+		impiegati.add(new Impiegato("Maria"));
+		impiegati.add(new Impiegato("Martina"));
+		impiegati.add(new Impiegato("Valentina"));
+		impiegati.add(new Impiegato("Mario"));
+		for (Impiegato impiegato : impiegati) {
+			System.out.println(impiegato.getName());
+		}
+	}
+
+	private static void usingMap() {
+		System.out.println("\nusingMap");
+		Map<String, String> m = new HashMap<>();
+		Set<String> s = m.keySet();
+		System.out.println(s.size());
+		m.put("Albuquerque", "NM");
+		System.out.println(m.size());
+
+		m = new TreeMap<>();
+		m.put("Maria", "F");
+		m.put("Mario", "M");
+		m.put("Alberto", "M");
+		System.out.println(m.size());
+		System.out.println(((TreeMap<String, String>) m).firstKey());
+		System.out.println(((TreeMap<String, String>) m).lastKey());
+	}
+}
diff --git a/src/com/oracle/java8/professional/collection/Impiegato.java b/src/com/oracle/java8/professional/collection/Impiegato.java
new file mode 100644
index 0000000..4f722d0
--- /dev/null
+++ b/src/com/oracle/java8/professional/collection/Impiegato.java
@@ -0,0 +1,36 @@
+package com.oracle.java8.professional.collection;
+
+public class Impiegato {
+	private String name;
+
+	public Impiegato(String name) {
+		this.name = name;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+
+		Impiegato impiegato = (Impiegato) o;
+
+		return name.equals(impiegato.name);
+	}
+
+	@Override
+	public int hashCode() {
+		return name.hashCode();
+	}
+}