BAEL-1069: Guide to diamond operator in Java (#2587)

* Matchers is now deprecated in Mockito 2, it's now replaced by ArgumentMatchers

* BAEL-1069: Guide to diamond operator in Java

* Changes after review

core-java/src/test/java/org/baeldung/java/diamond/Car.java

@@ -0,0 +1,5 @@
+package org.baeldung.java.diamond;
+
+public class Car<T extends Engine> implements Vehicle<T> {
+
+}

core-java/src/test/java/org/baeldung/java/diamond/DiamondOperatorUnitTest.java

@@ -0,0 +1,13 @@
+package org.baeldung.java.diamond;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+
+public class DiamondOperatorUnitTest {
+    @Test
+    public void whenCreateCarUsingDiamondOperator_thenSuccess() {
+        Car<Diesel> myCar = new Car<>();
+        assertNotNull(myCar);
+    }
+}

core-java/src/test/java/org/baeldung/java/diamond/Diesel.java

@@ -0,0 +1,10 @@
+package org.baeldung.java.diamond;
+
+public class Diesel implements Engine {
+
+	@Override
+	public void start() {
+		System.out.println("Started Diesel...");
+	}
+
+}

core-java/src/test/java/org/baeldung/java/diamond/Engine.java

@@ -0,0 +1,6 @@
+package org.baeldung.java.diamond;
+
+public interface Engine {
+
+	void start();
+}

core-java/src/test/java/org/baeldung/java/diamond/Vehicle.java

@@ -0,0 +1,5 @@
+package org.baeldung.java.diamond;
+
+public interface Vehicle<T extends Engine> {
+
+}

core-java/src/test/java/org/baeldung/java/rawtypes/RawTypesTest.java

@@ -0,0 +1,17 @@
+package org.baeldung.java.rawtypes;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+
+public class RawTypesTest {
+    @Test
+    public void shouldCreateListUsingRawTypes() {
+        @SuppressWarnings("rawtypes")
+        List myList = new ArrayList();
+        myList.add(new Object());
+        myList.add("2");
+        myList.add(new Integer(1));
+    }
+}