Mine

public class Node
{
    public static int X;
    public int N;
    public Node L;
    public Node R;
    

    public Node(int n) 
    {
        X = n;
	N = n;
    }
    
    public Node(int n, Node l, Node r) 
    {
        N = n;     
        L = l;
        R = r;    
    }

    public String toString(){return “Node ” + N;}
  
}

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Annan klass....kör...
Node n3 = new Node();
Node n6 = new Node(6,n3,new Node(5,n2,n4));