update: implement search recursiv

BinaryTree.java

@@ -7,6 +7,37 @@ public class BinaryTree {
     insert(content);
   }
 
+  public boolean search(int value) {
+     if (rootNode == null) {
+       return false;
+     }
+
+     return searchRecursiv(rootNode, value);
+  }
+
+  private boolean searchRecursiv(Node node, int value) {
+    int content = node.getContent();
+
+    if (value == content) {
+      return true;
+    } else if (value > content) {
+      Node leftNode = node.getLeftNode();
+      if (leftNode == null) {
+        return false;
+      }
+      return searchRecursiv(leftNode, value);
+    } else if (value < content) {
+      Node rightNode = node.getRightNode();
+      if (rightNode == null) {
+        return false;
+      }
+      return searchRecursiv(rightNode, value);
+    } else {
+      System.out.println("Something went wrong!");
+      return false;
+    }
+  }
+
   public void insert(int content) {
     if (rootNode == null) {
       Node newNode = new Node(content);