update: print Tree

BinaryTree.java

@@ -111,4 +111,32 @@ public class BinaryTree {
       }
     }
   }
+
+
+
+  // Print functions from https://www.baeldung.com/java-print-binary-tree-diagram
+  public void print() {
+    StringBuilder sb = new StringBuilder();
+    traversePreOrder(sb, "", "", rootNode);
+    System.out.println(sb.toString());
+  }
+  
+  private void traversePreOrder(StringBuilder sb, String padding, String pointer, Node node) {
+    if (node != null) {
+        sb.append(padding);
+        sb.append(pointer);
+        sb.append(node.getContent());
+        sb.append("\n");
+
+        StringBuilder paddingBuilder = new StringBuilder(padding);
+        paddingBuilder.append("|  ");
+
+        String paddingForBoth = paddingBuilder.toString();
+        String pointerForRight = "---";
+        String pointerForLeft = (node.getRightNode() != null) ? "+--" : "'--";
+
+        traversePreOrder(sb, paddingForBoth, pointerForLeft, node.getLeftNode());
+        traversePreOrder(sb, paddingForBoth, pointerForRight, node.getRightNode());
+    }
+  }
 }

Main.java

@@ -13,6 +13,7 @@ public class Main {
         binaryTree.insert(8);
         binaryTree.insert(16);
 
+        binaryTree.print();
 
         System.out.println(binaryTree.search(42));
         // Test values not in tree