class NodeMain {
    public static void main(String[] args) {
        MyNode mn = new MyNode(5);
        Node n = mn;            // A raw type - compiler throws an unchecked warning
        n.setData("Hello");
        Integer x = mn.data;    // Causes a ClassCastException to be thrown.
    }
}
 
class Node<T> {
 
    public T data;
 
    public Node(T data) { this.data = data; }
 
    public void setData(T data) {
        System.out.println("Node.setData");
        this.data = data;
    }
}
 
class MyNode extends Node<Integer> {
    public MyNode(Integer data) { super(data); }
 
    public void setData(Integer data) {
        System.out.println("MyNode.setData");
        super.setData(data);
    }
}
 

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