Master (#1250)

* Bean Injection Project is added

Different Types of Bean Injection article codes are added.

* Java-based configuration added

Java-based configuration and tests are added. Coding styles are fixed.

* List of Lists Article Codes added.

List of Lists Article Codes added.

core-java/src/test/java/com/baeldung/list/listoflist/ListOfListsTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.list.listoflist;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Before;
+import org.junit.Test;
+
+public class ListOfListsTest {
+
+    private List<ArrayList<? extends Stationery>> listOfLists = new ArrayList<ArrayList<? extends Stationery>>();
+    private ArrayList<Pen> penList = new ArrayList<>();
+    private ArrayList<Pencil> pencilList = new ArrayList<>();
+    private ArrayList<Rubber> rubberList = new ArrayList<>();
+
+    @SuppressWarnings("unchecked")
+    @Before
+    public void init() {
+        listOfLists.add(penList);
+        listOfLists.add(pencilList);
+        listOfLists.add(rubberList);
+
+        ((ArrayList<Pen>) listOfLists.get(0)).add(new Pen("Pen 1"));
+        ((ArrayList<Pencil>) listOfLists.get(1)).add(new Pencil("Pencil 1"));
+        ((ArrayList<Rubber>) listOfLists.get(2)).add(new Rubber("Rubber 1"));
+    }
+
+    @Test
+    public void givenListOfLists_thenCheckNames() {
+        assertEquals("Pen 1", ((Pen) listOfLists.get(0)
+            .get(0)).getName());
+        assertEquals("Pencil 1", ((Pencil) listOfLists.get(1)
+            .get(0)).getName());
+        assertEquals("Rubber 1", ((Rubber) listOfLists.get(2)
+            .get(0)).getName());
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    public void givenListOfLists_whenRemovingElements_thenCheckNames() {
+        ((ArrayList<Pencil>) listOfLists.get(1)).remove(0);        
+        listOfLists.remove(1);
+        assertEquals("Rubber 1", ((Rubber) listOfLists.get(1)
+            .get(0)).getName());
+        listOfLists.remove(0);
+        assertEquals("Rubber 1", ((Rubber) listOfLists.get(0)
+            .get(0)).getName());
+    }
+}