Initial data commit

Task/Doubly-linked-list-Element-insertion/Java/doubly-linked-list-element-insertion.java

@@ -0,0 +1,40 @@
+import java.util.LinkedList;
+
+@SuppressWarnings("serial")
+public class DoublyLinkedListInsertion<T> extends LinkedList<T> {
+
+    public static void main(String[] args) {
+        DoublyLinkedListInsertion<String> list = new DoublyLinkedListInsertion<String>();
+        list.addFirst("Add First 1");
+        list.addFirst("Add First 2");
+        list.addFirst("Add First 3");
+        list.addFirst("Add First 4");
+        list.addFirst("Add First 5");
+        traverseList(list);
+
+        list.addAfter("Add First 3", "Add New");
+        traverseList(list);
+    }
+
+    /*
+     * Add after indicated node.  If not in the list, added as the last node.
+     */
+    public void addAfter(T after, T element) {
+        int index = indexOf(after);
+        if ( index >= 0 ) {
+            add(index + 1, element);
+        }
+        else {
+            addLast(element);
+        }
+    }
+
+    private static void traverseList(LinkedList<String> list) {
+        System.out.println("Traverse List:");
+        for ( int i = 0 ; i < list.size() ; i++ ) {
+            System.out.printf("Element number %d - Element value = '%s'%n", i, list.get(i));
+        }
+        System.out.println();
+    }
+
+}