Mon Jan 06 08:30:32 GMT 2014 genericsAs Java still need to support Collection.get(Object) , it is easy to get NPE if you use wrong type accidentally http://jroller.com/page/sstirling?entry=map_get_object_and_java I met this problem when using wicket, one cool feature of ListMultipleChoice is that if the list I press into the constructor is not List However, if you use this API carelessly and think the List return from the HTML form is always List A related one but not really related to generics - http://www.pankaj-k.net/archives/2006/11/how_hard_is_tes.html , look like the behaviours difference of primittive and wrapper class at NULL is very easy to get hard to check bug Another one, JDK generic try to cast to wrong class internally: http://jroller.com/page/dhall?entry=exploring_the_limits_of_java Some cool feature, apply generic in comparable - http://tech.puredanger.com/2006/11/22/comparator-jdk5/ Wildcast in generic -http://javarevisited.blogspot.com[..]-is-bounded-and-unbounded-wildcards.html http://javarevisited.blogspot.com.au[..]trized-class-method-Generic-example.html http://mydailyjava.blogspot.com.au[..]6/advanced-java-generics-retreiving.html (google search) (amazon search) second |