Java
public void inOrder(){ 
  InOrderTraverse(root);
}

private void inOrderTraverse(TreeNode root){
  If( root != null){
       inOrderTraverse(root.left);
       System.out.print(root.val + “—>”);
       inOrderTraverse(root.right);
    }
}

 Java
public void inOrder(){ 
  InOrderTraverse(root);
}

private void inOrderTraverse(TreeNode root){
  If( root != null){
       inOrderTraverse(root.left);
       System.out.print(root.val + “—>”);
       inOrderTraverse(root.right);
    }
}