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Another mistake in JWeb+ ??

See El
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Posts: 44
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Take a look at the following question :
Question ID :1000049375480
Consider the following class:
public class MyHSAListener extends HttpSessionAttributeListener
public void attributeAdded(HttpSessionBindingEvent e){ }
public void attributeRemoved(HttpSessionBindingEvent e){ }
Which of the following statements are correct?
How come a class - MyHSAListener can extends an interface - HttpSessionAttributeListener ???
And there are more of this kind of mistake in JWeb+ (i.eg. missing semicolon, % etc which are essential in JSP thus cause misleading sometime.
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