Why does this compile?

Posted by akf on Stack Overflow See other posts from Stack Overflow or by akf
Published on 2009-09-29T22:35:14Z Indexed on 2010/06/14 0:42 UTC
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I was taken aback earlier today when debugging some code to find that something like the following does not throw a compile-time exception:

 public Test () { 
	 HashMap map = (HashMap) getList(); 
 }

 private List getList(){
	 return new ArrayList();
 }

As you can imagine, a ClassCastException is thrown at runtime, but can someone explain why the casting of a List to a HashMap is considered legal at compile time?

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