Add generic Node classes (#2782)

Co-authored-by: Andrii Siriak <siryaka@gmail.com>

DevUtils/Nodes/SimpleNode.java

@@ -0,0 +1,55 @@
+package DevUtils.Nodes;
+
+/**
+ * Simple Node implementation that holds
+ * a reference to the next Node.
+ * 
+ * @param <E> The type of the data held in the Node.
+ * 
+ * @author <a href="https://github.com/aitorfi">aitorfi</a>
+ */
+public class SimpleNode<E> extends Node<E> {
+    /** Reference to the next Node. */
+    private SimpleNode<E> nextNode;
+
+    /** Empty contructor. */
+    public SimpleNode() {
+        super();
+    }
+
+    /**
+     * Initializes the Nodes' data.
+     * 
+     * @param data Value to which data will be initialized.
+     * @see Node#Node(Object)
+     */
+    public SimpleNode(E data) {
+        super(data);
+    }
+
+    /**
+     * Initializes the Nodes' data and next node reference.
+     * 
+     * @param data Value to which data will be initialized.
+     * @param nextNode Value to which the next node reference will be set.
+     */
+    public SimpleNode(E data, SimpleNode<E> nextNode) {
+        super(data);
+        this.nextNode = nextNode;
+    }
+
+    /**
+     * @return True if there is a next node, otherwise false.
+     */
+    public boolean hasNext() {
+        return (nextNode != null);
+    }
+
+    public SimpleNode<E> getNextNode() {
+        return nextNode;
+    }
+
+    public void setNextNode(SimpleNode<E> nextNode) {
+        this.nextNode = nextNode;
+    }
+}