class Node2Main {
    public static void main(String[] args) {
        MyNode2 mn = new MyNode2(5);
        Node2 n = mn;            // A raw type - compiler throws an unchecked warning
        n.setData("Hello");
        n.setData(1);
        Integer x = (Integer) mn.data;    // Causes a ClassCastException to be thrown.
    }
}
 
class Node2 {
 
    public Object data;
 
    public Node2(Object data) { this.data = data; }
 
    public void setData(Object data) {
        System.out.println("Node2.setData");
        this.data = data;
    }
}
 
class MyNode2 extends Node2 {
    public MyNode2(Integer data) { super(data); }
 
    public void setData(Integer data) {
        System.out.println("MyNode2.setData");
        super.setData(data);
    }
}
 

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