public void inOrder(Node1 node)  
{  
    if(node != null)  
    {  
        inOrder(node.left);  
        node.displayData();  
        inOrder(node.right);  
    }  
}  

public void preOrder(Node1 node)  
{  
    if(node =! null){  
        node.displayData();  
        preOrder(node.left);             
        preOrder(node.right);  
    }  
}  

public void postOrder(Node1 node)  
{  
    if(node != null)  
    {  
        postOrder(node.left);  
        postOrder(node.right);  
        node.displayData();            
    }  
}  
public static void main(String[] agrs)   
{  
    traversal bst = new traversel();  
    bst.insert(25);  
    bst,insert(10);  
    bst.insert(15);  
    bst.insert(89);  
    bst.insert(79);  
   
    System.out.println("Inorder traversal of binary tree");  
    bst.inOrder(bst.root1);  
    System.out.println();  
    System.out.println("Preorder traversal of binary tree");  
    bst.preOrder(bst.root1);  
    System.out.println();  
    System.out.println("Postorder traversal of binary tree");  
    bst.postOrder(bst.root1);  
    System.out.println();  
}  

}

This is my Binary tree pre order, post order and in order code.in this code the output is not visible and it shows an error. I couldn’t find the error in here.
can someone help me to solve this.