Finished Tree Traversal Day 1 Livecode

src/Traversal.java

@@ -1,5 +1,21 @@
 public class Traversal {
   public static void main(String[] args) {
+    TreeNode root = new TreeNode(10);
+
+    root.left = new TreeNode(9);
+    root.right = new TreeNode(15);
+    root.left.left = new TreeNode(5);
+    root.left.right = new TreeNode(2);
+    root.right.left = new TreeNode(-3);
+    root.right.right = new TreeNode(5);
+    root.right.right.right = new TreeNode(22);
 
+    preorder(root);
   }
-}
+  public static void preorder(TreeNode current) {
+    if (current == null) return;
+    System.out.println(current.data);
+    preorder(current.left);
+    preorder(current.right);
+  }
+}

src/TreeNode.java

@@ -1,4 +1,9 @@
 public class TreeNode {
+    public int data;
+    public TreeNode left;
+    public TreeNode right;
 
-
+    public TreeNode(int data) {
+        this.data = data;
+    }
 }