BAEL-376 - Adding more test code

core-java/src/main/java/com/baeldung/generics/Building.java

@@ -1,5 +1,12 @@
+package com.baeldung.generics;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Building {
+	private static final Logger LOGGER = LoggerFactory.getLogger(Building.class);
+
 	public void paint() {
+		LOGGER.info("Building");
 	}
 }

core-java/src/main/java/com/baeldung/generics/Generics.java

@@ -1,3 +1,5 @@
+package com.baeldung.generics;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -21,9 +23,7 @@ public class Generics {
 	// example of a generic method with a wild card, this method can be used
 	// with a list of any subtype of Building
 	public static boolean paintAllBuildings(List<? extends Building> buildings) {
-		for (Building building : buildings) {
-			building.paint();
-		}
+		buildings.stream().forEach(Building::paint);
 		return true;
 	}
 

core-java/src/main/java/com/baeldung/generics/House.java

@@ -0,0 +1,12 @@
+package com.baeldung.generics;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class House extends Building {
+    private static final Logger LOGGER = LoggerFactory.getLogger(House.class);
+
+    public void paint() {
+        LOGGER.info("House");
+    }
+}

core-java/src/main/java/com/baeldung/generics/SubBuilding.java

@@ -1,4 +0,0 @@
-
-public class SubBuilding extends Building {
-
-}