public class testing{

    public class node implements Comparable<node>{
        int data;

        public node(int data){
            this.data = data;
        }
        
        @Override
        public int compareTo(node n){
            return data - n.data;
        }
    }

    public static void main(String[] args) {
        testing t = new testing();

        node n1 = t.new node(5);
        node n2 = t.new node(10);

        System.out.println(n1.compareTo(n2));
    }
}