Merge pull request #1 from TheMessik/graph

Graph

src/graph/Graph.java

@@ -0,0 +1,11 @@
+package graph;
+
+import java.util.List;
+
+public abstract class Graph {
+    protected List<Node> nodes;
+
+    public List<Node> getAllNodes() {
+        return nodes;
+    }
+}

src/graph/Node.java

@@ -0,0 +1,20 @@
+package graph;
+
+import java.util.List;
+
+public abstract class Node {
+    private final String item;
+    private List<Node> children;
+
+    public Node(String item) {
+        this.item = item;
+    }
+
+    public String getItem() {
+        return item;
+    }
+
+    public List<Node> getChildren() {
+        return children;
+    }
+}