title: Practical use of IdentityHashMap in Java 6
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/838528/use-cases-for-identityhashmap">Use cases for IdentityHashMap</a>  </p>
  </blockquote>
  
  
  
  <p>What could be a practical use of the IdentityHashMap introduced in Java 5?</p>