[item29] 힙 오염의 정확한 의미 #47

/**
 * https://en.wikipedia.org/wiki/Heap_pollution
 */
public class HeapPollutionDemo
{
    public static void main(String[] args)
    {
        Set s = new TreeSet<Integer>();
        Set<String> ss = s;              // unchecked warning
        s.add(new Integer(42));          // another unchecked warning
        Iterator<String> iter = ss.iterator();

        while (iter.hasNext())
        {
            String str = iter.next();    // ClassCastException thrown
            System.out.println(str);
        }
    }
}