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java se java se advance javaee servlet jsp java ee basic oop try with resource java se basic polymorphism jdbc mysql connection pooling generic list stack queue map java generic inheritance enscapsulatioin collection array stringtokenizer stringbuffer stringbuilder character string scwcd java jsp jstl jsp el expression language throw throws try finally try catch exception java exception java nio stream java io anonymous inner class method local inner class regular inner class inner class nested class set collection api hardcode multi-language localization internationlization matcher pattern regex regular expression conversion type jstl